May we not say that, in the fortuitous combination of the productions of Nature, since only those creatures "could" survive in whose organizations a certain degree of adaptation was present, there is nothing extraordinary in the fact that such adaptation is actually found in all these species which now exist? Chance, one might say, turned out a vast number of individuals; a small proportion of these were organized in such a manner that the animals' organs could satisfy their needs. A much greater number showed neither adaptation nor order; these last have all perished... Thus the species which we see today are but a small part of all those that a blind destiny has produced.