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←Subtitle not present 1859 1860 1861 The Probable Effects of the Action of Natural Selection through Divergence of Character and Extinction , on the Descendants of a Common Ancestor. 1866 1869 1872
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Edwards. No physiologist doubts that a stomach
by being
....
adapted to digest vegetable matter alone, or flesh alone, draws most nutriment from these substances. So in the general economy of any land, the more widely and perfectly the animals and plants are diversified for different habits of life, so will a greater number of individuals be capable of there supporting themselves. A set of animals, with their organisation but little diversified, could hardly compete with a set more perfectly diversified in structure. It may be doubted, for instance, whether the Australian marsupials, which are divided into groups differing but little from each other, and feebly representing, as Mr. Waterhouse and others have remarked, our carnivorous, ruminant, and rodent mammals, could successfully compete with these
well-developed
well-pronounced
orders. In the Australian mammals, we see the process of diversification in an early and incomplete stage of development.
After the foregoing discussion, which ought to have been much
compressed,
amplified,
we
may
may,
I think,
I think,
assume that the modified descendants of any one species will succeed
by
by
so much the better as they become more diversified in structure, and are thus enabled to encroach on places occupied by other beings. Now let us see how this principle of
great
....
benefit being derived from divergence of character, combined with the principles of natural selection and of extinction,
will
will
tends
tend
to act.
The accompanying diagram will aid us in understanding this rather perplexing subject. Let A to L represent the species of a genus large in its own country; these species are supposed to resemble each other in unequal
degress,
degrees,
as is so generally the case in nature, and as is represented in the diagram by the letters standing at unequal distances. I have said a large genus, because we have seen in the second chapter,