Chapter II: Part I: THE DATA OF BIOLOGY.—Including those general truths of

Physics and Chemistry with which rational Biology must set out.

II. THE INDUCTIONS OF BIOLOGY.—A statement of the leading
generalizations which Naturalists, Physiologists, and Comparative
Anatomists, have established.

III. THE EVOLUTION OF LIFE.—Concerning the speculation commonly
known as “The Development Hypothesis”—its _à priori_ and _à
posteriori_ evidences.

VOL. II.

IV. MORPHOLOGICAL DEVELOPMENT.—Pointing out the relations that are
everywhere traceable between organic forms and the average of the
various forces to which they are subject; and seeking in the
cumulative effects of such forces a theory of the forms.

V. PHYSIOLOGICAL DEVELOPMENT.—The progressive differentiation of
functions similarly traced; and similarly interpreted as
consequent upon the exposure of different parts of organisms to
different sets of conditions.

VI. THE LAWS OF MULTIPLICATION.—Generalizations respecting the
rates of reproduction of the various classes of plants and
animals; followed by an attempt to show the dependence of these
variations upon certain necessary causes.[2]

THE PRINCIPLES OF PSYCHOLOGY.

VOL. I.