His not having done so is of a piece with his silence about Buffon, Erasmus Darwin, and Lamarck in the early editions of the “Origin of Species,” and with the meagre reference to them which is alone found in the later ones. It is of a piece also with the silence which Mr. Darwin invariably maintained when he saw his position irretrievably damaged, as, for example, by Mr. Spencer’s objection already referred to, and by the late Professor Fleeming Jenkin in the _North British Review_ (June 1867). Science, after all, should form a kingdom which is more or less not of this world. The ideal scientist should know neither self nor friend nor foe—he should be able to hob-nob with those whom he most vehemently attacks, and to fly at the scientific throat of those to whom he is personally most attached; he should be neither grateful for a favourable review nor displeased at a hostile one; his literary and scientific life should be something as far apart as possible from his social; it is thus, at least, alone that any one will be able to keep his eye single for facts, and their legitimate inferences. We have seen Professor Mivart lately taken to task by Mr. Romanes for having said {248a} that Mr. Darwin was singularly sensitive to criticism, and made it impossible for Professor Mivart to continue friendly personal relations with him after he had ventured to maintain his own opinion. I see no reason to question Professor Mivart’s accuracy, and find what he has said to agree alike with my own personal experience of Mr. Darwin, and with all the light that his works throw upon his character.