All that at present can be said with certainty, is that, as with the individual, so with the species, the hour of life has run its course, ans is spent.
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It is mere rubbish thinking, at present, of origin of life; one might as well think of origin of matter.
A grain in the balance will determine which individual shall live and which shall die - which variety or species shall increase in number, and which shall decrease, or finally become extinct.
If numerous species, belonging to the same genera or families, have really started into life all at once, the fact would be fatal to the theory of descent with slow modification through natural selection.
We shall best understand the probable course of natural selection by taking the case of a country undergoing some slight physical change, for instance, of climate. The proportional numbers of its inhabitants will almost immediately undergo a change, and some species will probably become extinct.
Species of the same genus would occasionally exhibit reversions to lost ancestral characters.
When we descend to details we can prove that no one species has changed; nor can we prove that the supposed changes are beneficial, which is the groundwork of the theory.
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