Chapter XVIII

Return to the peaks abandoned by the original nebula.
An idea of their number 319
Example of their dimensions. What was made out of them 320
What could be made from one of them 321
How it could be divided into comets and meteor swarms 322
An example given. How a comet may rotate on its axis.
And what might be explained thereby. Orbits and
periods of revolution 323
Not ejected from planets. Their true origin 324
Study of the velocities in orbit of comets, and
results thereof 326
How far comets may wander from the sun and return again 327
No reason why comets should wander from one sun to another.
Confirmatory of the description, in Chapter XV. of the
sun's domains 328
Of the eternal evolution and involution of matter.
The atmosphere and corona of the sun 329
Partial analogy between it and the earth's atmosphere 331
The density of it near the sun's surface cannot be normally
less than 28 atmospheres, but might be so partially
and accidentally 332
Probable causes of the enormous height of its atmosphere 332
The mass taken into account, but cannot be valued 334
Most probably no matter in the sun exceeds half the density
of water. The unknown line in the spectrum of the
corona belongs to the ether 335

NEW THEORIES IN ASTRONOMY.