23. At this epoch beds of earthly sediment began to form, deposited by waters charged with lime and other matters peculiar to organic life.
Then appeared the first living beings of the vegetable and animal kingdom. At first few in number, one finds more and more frequent traces of such as one penetrates more and more deeply into the beds of this formation. It is to be remarked, that everywhere life is manifested as soon as conditions are propitious to vitality, and that each species is born as soon as the proper conditions of its existence are produced.