“We must distinguish clearly (though this is not usually done) between, firstly, the theory of descent as advanced by Lamarck, which deals only with the fact of all animals and plants being descended from a common source, and secondly, Darwin’s theory of natural selection, which shows us _why_ this progressive modification of organic forms took place” (p. 93). This passage is as inaccurate as most of those by Professor Haeckel that I have had occasion to examine have proved to be. Letting alone that Buffon, not Lamarck, is the foremost name in connection with descent, I have already shown in “Evolution Old and New” that Lamarck goes exhaustively into the how and why of modification. He alleges the conservation, or preservation, in the ordinary course of nature, of the most favourable among variations that have been induced mainly by function; this, I have sufficiently explained, is natural selection, though the words “natural selection” are not employed; but it is the true natural selection which (if so metaphorical an expression is allowed to pass) actually does take place with the results ascribed to it by Lamarck, and not the false Charles-Darwinian natural selection that does not correspond with facts, and cannot result in specific differences such as we now observe. But, waiving this, the “my’s,” within which a little rift had begun to show itself in 1866, might well become as mute in 1869 as they could become without attracting attention, when Mr. Darwin saw the passages just quoted, and the hundred pages or so that lie between them.