Chapter V: Natural Philosophy (2)

But "Darwinism produces its changes and differentiations out of nothing." Darwin thoroughly understands that he is engaged with the causes which have produced changes in individuals and in the second place he is engaged with the mode in which such individual differentiations tend to mark off a race, a genus, or a species. Darwin moreover was less occupied in discovering these causes, which up to the present are either entirely unknown or on which there is only general information, than in discovering a rational form in which to establish their reality, to embrace their permanent significance. But Darwin ascribed too wide a reach to his discovery in this that he made it an exclusive means of variation in species and neglected the causes of individual differentiations from the general form. This mistake however is common to most people who make a step forwards. Next, if Darwin produces his changes in individual types out of nothing and thereby excludes the wisdom of the breeder, the breeder on his part must not only display his wisdom but he must produce out of nothing real changes in plant and animal forms. But who has given the impetus to the investigation as to whence these variations and differentiations proceed? It is again no one but Darwin.

Lately the conception of natural selection has been broadened, by Haeckel, in particular, and the variation of species has been shown to be the result of actual change owing to adaptation and inheritance, whereby adaptation is considered as the source of variations and heredity as the conserving element in the process. Even this is not correct in Herr Duehring's eyes. "Peculiar adaptation to the circumstances of life as they are offered or withheld by nature supposes impulses and facts which answer to the conception. Hence adaptation is only apparent and actual causality does not elevate itself above the lowest steps of physical, chemical and plant physiology." It is again the name which provokes Herr Duehring. But how does he deal with the matter? The question is if such changes do take place in the species of organic beings or not. And again Herr Duehring has no reply.

"If a plant in the course of its growth takes a direction by which it gets the most light the result is nothing but a combination of physical forces and chemical agents, and if we are to call it an adaptation, not metaphorically but strictly, confusion is certain to arise in the motion." This man is so exacting with other people because he is quite well acquainted with the intentions of nature and speaks of the subtlety of nature, even of its will. There is confusion, indeed, but with whom, with Haeckel or with Herr Duehring?

And the confusion is not only spiritual but logical. We have seen that Herr Duehring put forth all his efforts to make the purpose idea in nature real. "The relation of means and end does not by any means show a conscious intention." But what is adaptation without conscious intention, without any intrusion of design of which he complains so loudly, but an unconscious teleology?

If the color of tree frogs and leaf eating insects is as a rule green and that of beasts that inhabit the desert sandy-yellow, and that of polar animals white, they have certainly not come into possession of this coloring intentionally or through any kind of mental process, on the contrary the coloring can only be explained by means of the operation of physical substances and chemical agents. And yet it cannot be denied that by these colors these animals are particularly adapted to the conditions in which they are and it is certain that they are by their means rendered less visible to their enemies. Just of a similar nature are the organs by which certain plants seize and consume certain insects (the means being on their under side, suited to this purpose and adapted to this end). Now if Herr Duehring insists that the adaptation must be realised through the operation of thought, he only says that the purpose must be carried out through mental operation, must be conscious and intentional. Thus again, just as in the philosophy of realism we arrive at the Creator with a purpose, at God. Formerly this kind of declaration was called "deism" and Herr Duehring says that we had not much regard for it, but it now appears that the world has gone backwards in this respect also.

From adaptation we come to heredity and here according to Herr Duehring Darwinism is quite out. "The whole organic world, Darwin explained, came from a single germ, is, so to speak, the brood of a single being. Independent similar products of nature according to Darwin do not exist without heredity and his retrogressive philosophy must come to a full stop when the end of the thread of ancestry is reached, or the original vegetable form."

The statement that Darwin traced all existing organisms from one original germ is to put it politely a piece of pure imagination on the part of Herr Duehring. Darwin says distinctly on the last page of the Origin of Species, Sixth Edition, that he regards all living beings not as separate creations but as the descendants in a direct line from some fewer beings and Haeckel makes a distinct advance on this ascribes "an entirely distinct source for plants and another for the animal kingdom" and on and between both of them "a number of original stems each of which has developed independently from one single primary monistic form." (History of Creation page 397.) This original form of life Herr Duehring discovers solely to bring it into contempt by paralleling it with the first man according to Jewish tradition, Adam. Here, unfortunately for Herr Duehring, he does not know how this original Jew turns out, according to Smith's Assyrian discoveries to have been the original Semite, and that the entire Biblical story of the Creation and the Flood has been shown to have been taken from a legendary store common to the Jews, Babylonians, Chaldeans, and Assyrians.

It is brought forward as a severe and irrefutable reproach to Darwin that he is at an end where the thread of descent fails him. Unfortunately the whole of our science deserves the same reproach. When the thread of descent fails it it is "at an end." It has not yet come to the point of creating organic beings without an ancestry, not even once has it been able to make simple protoplasm or other albuminous bodily forms out of the chemical elements. It can only say therefore with any certainty regarding the origin of life, that it must have come about by a chemical process. But perhaps the philosophy of realism can give us some assistance here since it is engaged with independent organic natural products, without any descent one from another. How can these come into being? By original creation? But up to the present not even the most audacious advocates of spontaneous generation have claimed to create in this way anything except bacteria, fungi, or other very elementary organisms, but not insects, birds, fish or mammals. If these homogeneous products of nature--it is understood for all this discussion that they are organic--are not related through descent, they or their ancestors, then "where the thread of descent breaks" they must have been placed in the world by a separate act of creation, and this again requires a creator, what we call "deism."

Herr Duehring further explains that "it was a piece of superficiality on the part of Darwin to make the mere fact of the sex-composition of qualities the foundation for the existence of these qualities." Here we have again a piece of pure imagination on the part of our profound philosopher. On the contrary Darwin says that natural selection has to do only with the maintenance of variations and not with their origin. This new supposition however of things which Darwin did not say serves to assist us to this deep idea of Duehring. "If a principle of individual variation had been sought in the inner scheme of creation it would have been an entirely rational idea. For it is natural to unite the idea of universal generation with that of sex propagation, and to regard the so-called original creation from the higher point of view, not as absolutely antagonistic to reproduction but even as reproduction itself." And the man who could write this is not ashamed to reproach Hegel with writing jargon.

Let us call a halt to the vexatious and contradictory babble with which Herr Duehring proclaims his wrath against the advance given to science by the theory of Darwin. Neither Darwin nor his followers among the natural scientists have any idea of belittling Lamark's tremendous services, in fact they are the very people who first restored his fame. But we are unable to ignore the fact that in the time of Lamark science was still far from supplied with competent material to enable it to answer the question of the origin of species other than in a prophetic or, as it were anticipatory, manner. In addition to the enormous amount of material in the realm of general, as well as of that of anatomical, botany and zoology, accumulated since that time, two entirely new sciences have since come into existence--the investigation of the development of plant and animal germs (embryology), and the investigation of the organic survivals in the earth's crust which still remain. There is a distinct similarity between the steps in the development of the organic germ to mature organism, and the successive steps by which plants and animals succeed each other in the history of the world. It is just this similarity which has placed the evolution theory on its most secure foundations. The theory of evolution is however still very young and it is beyond question that upon further investigation the rigid Darwinian ideas upon the origin of species will be considerably modified.

But what has the realist philosophy of a positive nature to contribute with respect to the evolution of organic life? "The variation of species is an acceptable supposition, but there exists, in addition, the independent order of the products of nature belonging to the same species without any intervention of descent." According to this we are to conclude that products of unlike species, that is species which vary, are descended from one another, but those of similar species not. But even this is not altogether correct, for he ventures to say of the varying species, "The part played by descent is on the contrary a very secondary activity of nature." There is heredity, then, but it is only to be reckoned as a factor of the second class. Let us be glad that heredity of which Herr Duehring has said so much that is evil and mysterious is at least let in by the back door. It is just the same with natural selection, since after all his moral indignation with respect to the struggle for existence by means of which natural selection fulfils itself he suddenly exclaims, "The most important constituent is to be found in the conditions of life and cosmic conditions, while natural selection as set forth by Darwin may be considered as secondary." Natural selection still exists, even if a factor of the second class, like the struggle for existence, and the clerical malthusian surplus-population theory. That is all, for the rest Herr Duehring refers us to Lamark.

Finally, he warns against misuse of the terms metamorphosis and evolution. Metamorphosis, he says, is a very obscure notion, and the concept of evolution is only admissible in so far as a law of evolution can be really proved. Instead of either of these expressions we should employ the term "composition" and then everything would be all right. It is the same old story over again, Herr Duehring is satisfied if we change the names. If we speak of the evolution of the chicken in the egg we give rise to confusion because we have only an incomplete knowledge of the law of evolution. But if we speak of its "composition" everything becomes clear. We must therefore say no longer "this child is growing nicely" but, "he composes himself splendidly," and we congratulate Herr Duehring upon the fact that he is not only a peer of the author of the Niebelungen Ring in his opinion of himself but in his own particular capacity is also a composer of the future.

_Organic World (Conclusion)._

"One reflects upon our natural philosophical portion of positive knowledge in order to fix it relatively to all one's scientific hypotheses. Next in importance come all the actual acquisitions of mathematics as well as the leading principles of exact science in mechanics, physics and chemistry and particularly the scientific results in physiology, zoology, and antiquarian investigation."

Herr Duehring speaks in this confident and decided fashion with respect to the mathematical and scientific scholarship of Herr Duehring. One cannot detect in its meager shape and in its scanty and audacious results the extent of positive knowledge which lies behind. Every time the oracle is consulted for a definite statement as regards physics or chemistry we get nothing as regards physics but the equation which expresses the mechanical equivalent of heat, and concerning chemistry only this that all bodies are divisible into elements and combinations of elements. He who can speak as Duehring does about "gravitating atoms" shows at once that he is quite at a loss to understand the difference between an atom and a molecule. Atoms, of course, exist, not with respect to gravitation or any other physical or mechanical form of motion, but only as concerns chemical action. And if the last chapter on organic nature is read, the empty, self-contradictory, assertive, oracular, stupid, circuitous absolute nothingness of the final result lead one to the conclusion that Herr Duehring talks about things of which he knows very little and this conclusion becomes a certainty when we come to his proposal in the course of his writing on organic life (biology) to use the term "composition" instead of evolution. He who can make such a suggestion as that gives evidence that he is not acquainted with the building up of organic bodies.

All organic bodies, the very lowest excepted, develop from small cells by the increment of visible pieces of albumen with a central cell. The cell generally develops an outer skin and the contents are more or less fluid. The lowest cell-bodies develop from one cell; the enormous majority of organic beings are many-celled and among the lower forms these take on similar, and among the higher forms greater variations of, groupings and activities. In the human body for example are bones, muscles, nerves, sinews, ligaments, cartilage, skin, all either made up of cells or originating in them. But for all organic bodies, from the amoeba which is a simple and for the most part unprotected piece of albumen with a cell centre in the midst to man, and from the smallest one-celled desmidian to the highest developed plant, the mode is one and the same by which the cells propagate themselves, that is by division. The cell centre is first laced across its midst, the lacing which separates the centre into two knobs becomes stronger and stronger and at last they become separated and two cell centres are formed. The same occurrence takes place in the cell itself. Each of the cell centres becomes the middle point of a collection of cell stuff which by knitting ever closer becomes combined with the other, and finally both of them part and live on as separate cells. Through such repeated cell divisions the full sized animal gradually develops from the germ of the animal egg after fructification and the substitution of used up cells in the full grown animal is brought about similarly. To call such a process "composition" and to speak of the term "evolution" as a purely imaginary term belongs to one who does not know anything of the matter, hard as it is to imagine such ignorance at this date.

We have still somewhat to say with respect to Herr Duehring's views of life in general. Elsewhere he sets forth the following statement with respect to life. "Even the inorganic world is a self-regulated system but one may undertake to speak of life in the proper sense first when the organs and the circulation of matter through special separate channels from a central point to another germ collection of a minor formation begin."

If life begins where the separate organs begin then we must hold all Haeckel's protozoa (Protistenreich) and probably many others as dead; all organisms at least up to those composed of one cell and those included are not capable of life. If the means of circulation of matter through different channels is the distinguishing mark of life we must place outside of this definition all the upper classes of the colenterata entirely, with the exception of the medusae, and therefore all the polypi and other plant animals are also to be considered as being outside the class of living creatures. And if the circulation of matter through different canals from an inner point is the distinguishing characteristic of life we must reckon all animals as dead which either have no heart or several hearts. Besides these there belong also to this category all worms, starfish and ringed creatures (annuloids and annulous according to Huxley's definition) a portion of the shell fish, crabs, and finally a vertebrate animal, the lancelet (amphioxus) and all plants.

When Herr Duehring therefore undertakes to distinguish life narrowly and strictly, he gives four mutually contradictory modes of distinguishing life, one of which condemns not only the whole of plant life but about half the animal kingdom to eternal death. No one can accuse him of having deceived us when he promised us peculiar results based on individual ideas.

In another place he says "There is a simple fundamental type in nature belonging to all organisms from the lowest to the highest" and this type is to be met "in the subordinate movements of the most undeveloped plants." This is again an absolutely false statement. The simplest type in the whole of organic nature is the cell, and it lies universally at the foundation of the highest organisms. On the other hand there is a substance among the lowest organisms lower even than the cell, the protomoeba, a single piece of undifferentiated protoplasm, without any differentiation, a complete series of monads and the entire class of siphoneae. All of these are connected with the higher organisms only by virtue of the fact that protoplasm is its substantial foundation, and that they fulfill the functions of protoplasm, that is they live and die.

Further Herr Duehring tells us "physiologically the concept of existence consists in this, that it embraces a single nerve apparatus. Sensation is therefore the characteristic of all animal organisms that is the capacity of conscious subjective recognition of circumstances. The sharp line of differentiation between plants and animals consists in the leap to sensation. This distinguishing line cannot any more be abolished by known forms of transition than it can be brought into existence by the logical necessity of externally distinguishable characteristics." And further "Plants are totally and eternally without sensation and are devoid of the faculty for it."

In the first place Hegel says that "sensation is the specific differentiation, the distinguishing mark of the animal." Thus one of Hegel's erudite statements becomes an indubitable truth of the last instance merely by being copied into Herr Duehring's book.

In the second place we now arrive for the first time at the forms of transition between animals and plants. That these intermediate forms exist, that there are organisms concerning which we are unable to say flatly whether they are plants or animals, that we are therefore unable to fix accurately the frontiers between plant and animal life, all these things make Herr Duehring logically anxious to fix a decisively distinguishing line, which in the next breath he declares cannot be thoroughly relied on. But there is no need for us to go to the doubtful region; intermediate between plants and animals are sensitive plants which at the least contact fold their leaves or close their petals. Are insect eating plants utterly without sensation? Even Herr Duehring cannot make such an assertion without indulging in "unscientific half-poetry."

In the third place Herr Duehring is again giving free rein to his imagination when he says that sensation is psychologically existent, even when the nerve apparatus is exceedingly simple. This is found regularly among reptiles yet Herr Duehring is the first to say that they have no sensation because they have no nerves. Sensation is not necessarily bound up with nerves but it is bound up with some albuminous substance the true nature of which has not yet been discovered.

In addition, the biological knowledge of Herr Duehring becomes exceedingly evident in that he is not ashamed to fling at Darwin the question do animals develop from plants? so that it is a question whether he is more ignorant with regard to plants or animals.

Of life in general Herr Duehring can only tell us "The change in the form of matter which fulfills itself by plastic constructive arrangement remains a distinguishing characteristic of the individual life-process."

That is all that we learn of life and with respect to the plastic creative arrangement we sink knee deep in the nonsense of Duehring's jargon. If we want to learn what life is we shall have to look at the problem a little more closely on our own account.

That organic change in matter is the most universal and distinctive evidence of life has been declared by physiological chemists and chemical physiologists times without number during the last thirty years and their utterances are translated by Herr Duehring into his own clear and elegant language. But to define life as an organic change of matter is simply to define life as life, for organic change of matter, or change of matter with plastic creative arrangement is a statement which must itself be explained by life, and the explanation in its turn by the difference between organic and inorganic, that is between that which is alive and that which is not alive. So that with this explanation we do not get at the problem.

Organic change, as such, is frequently found where life does not exist. There are whole series of processes in chemistry, which by the proper combination of the elements, produce again their own conditions, so that thereby a certain body is the creator of a process. Thus in the manufacture of sulphuric acid by the burning of sulphur, there is created in this process sulphuric dioxide SO_{2}, and if one add steam and nitric acid thereto, the sulphuric dioxide takes up the water and the oxygen and becomes H_{2} SO_{4}. Nitric acid gives off oxygen and becomes nitric oxide, this nitric oxide simultaneously takes up new oxygen from the atmosphere and is transformed into a higher oxide of nitrogen and from this acid sulphuric dioxide is again given off and made by the same process, so that, theoretically, an infinitely small amount of nitric acid should be effective to transform an unlimited quantity of sulphuric dioxide, oxygen and water into sulphuric acid. Change in matter regularly occurs through the passing of fluids through dead organic and inorganic membranes as in the artificial cells of Traube. It therefore appears that there is no progress by the way of organic change for the quality of organic change which was to explain life must itself be explained by life. We must therefore seek it elsewhere.

Life is a mode of existence of protoplasm and consists essentially in the constant renewal of the chemical constituents of this substance. Protoplasm is here understood in the modern chemical sense and comprises under this name all substances analogous to the white of an egg, otherwise called protein substances. The name is not satisfactory, for the ordinary white of egg plays the least active role of all transformed substances, since it only serves as mere nourishment for the yolk, for the self-developing germ. As long however as so little is known of the chemical constituents of protoplasm the name is better than any other because more inclusive.

Whenever we discover life we also find it bound up with protoplasm, and when we find a piece of protoplasm not in solution there we find also life, without exception. Doubtless the presence of other chemical constituents is necessary to a living body, to produce the various differentiations of these elements of life. They are not necessary to life in itself, hence they enter as food and become transformed into protoplasm. The lowest forms of life with which we are acquainted are nothing but simple pieces of protoplasm and yet they have all the appearance of living objects.

But in what consist these signs of life which are common to all living objects? In this, that the protoplasm takes from its surroundings other matter suitable to itself and assimilates it while other former portions of the body become decomposed and are thrown off. Other things, not living bodies, decompose or make combinations, but cease thereby to be what they were. The rock worn by atmospheric action is no longer rock, the metal which becomes oxidised goes off in rust. But what causes the destruction of dead bodies is the essential of the existence of living protoplasm. From the very moment when the unbroken interchange in the constituents of protoplasm ceases, the continual interchange of receiving and throwing off, from that moment the protoplasmic substance itself ceases, becomes decomposed, that is, dies.

Life, the mode of existence of protoplasmic substance, therefore consists in this, that at one and the same moment it is itself and something else, and this is not the result of a process to which it is compelled by external agency, since this may happen also with objects which are dead. On the contrary life, which is change of matter, is consequent upon nourishment and throwing off, is a self-fulfilling process inherent in its medium, protoplasm, without which it cannot exist. Hence, it follows that if chemistry should ever discover how to make protoplasm artificially, this protoplasm must show some signs of life, even if very insignificant. It is, of course, doubtful if chemistry will discover the proper food for this protoplasm at the same time as the protoplasm.

Through the changes in matter produced by nourishment and throwing off, as actual functions of the protoplasm, and through its own plasticity, proceed all the other most simple factors of life, sensibility which consists in the interchange between the protoplasm and its food, contractibility which shows itself at a very low stage in the consumption of food, possibility of growth which is shown in the lowest stages of development by splitting, and internal motion without which neither the consumption nor assimilation of food is possible.

Our definition of life is, of course, very incomplete since in order to include all the widely differing manifestations of life it must confine itself to the most universal and simple. Definitions are of little scientific worth. In order to determine what life is we must examine all forms of its manifestation from the lowest to the highest. For ordinary use such definitions are very convenient and in a certain sense indispensable, and they can do no harm as long as their inevitable deficiencies are not forgotten.

(The remainder of this section simply teases Herr Duehring.)