But in a secondary sense those things are called substances within which, asspecies, the primary substances are included; also those which, as genera, include thespecies.

Now in this case the name of thespecies man' is applied to the individual, for we use the term 'man' in describing the individual; and the definition of 'man' will also be predicated of the individual man, for the individual man is both man and animal.

'Animal' is predicated of thespecies 'man', therefore of the individual man, for if there were no individual man of whom it could be predicated, it could not be predicated of thespecies 'man' at all.

Of secondary substances, thespecies is more truly substance than the genus, being more nearly related to primary substance.

Wallace, who is now studying the natural history of the Malay archipelago, has arrived at almost exactly the same general conclusions that I have on the origin ofspecies. Last year he sent to me a memoir on this subject, with a request that I would forward it to Sir Charles Lyell, who sent it to the Linnean Society, and it is published in the third volume of the Journal of that Society.

In considering the Origin ofSpecies, it is quite conceivable that a naturalist, reflecting on the mutual affinities of organic beings, on their embryological relations, their geographical distribution, geological succession, and other such facts, might come to the conclusion that eachspecies had not been independently created, but had descended, like varieties, from otherspecies.

I will then pass on to the variability ofspecies in a state of nature; but I shall, unfortunately, be compelled to treat this subject far too briefly, as it can be treated properly only by giving long catalogues of facts.

In the four succeeding chapters, the most apparent and gravest difficulties on the theory will be given: namely, first, the difficulties of transitions, or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ; secondly the subject of Instinct, or the mental powers of animals, thirdly, Hybridism, or the infertility ofspecies and the fertility of varieties when intercrossed; and fourthly, the imperfection of the Geological Record.

The relationship, though distant, between the Macrauchenia and the Guanaco, between the Toxodon and the Capybara, -- the closer relationship between the many extinct Edentata and the living sloths, ant-eaters, and armadillos, now so eminently characteristic of South American zoology, -- and the still closer relationship between the fossil and livingspecies of Ctenomys and Hydrochaerus, are most interesting facts.

What, then, has exterminated so manyspecies and whole genera?

Every animal in a state of nature regularly breeds; yet in aspecies long established, any great increase in numbers is obviously impossible, and must be checked by some means.