I-8. We suspect that this is not an ultimate fact, but a natural consequence of inheritance—the inheritance of disease or of tendency to disease, which close interbreeding perpetuates and accumulates, but wide breeding may neutralize or eliminate.
I-9. The rules and processes of breeders of animals, and their results, are so familiar that they need not be particularized. Less is popularly known about the production of vegetable races. We refer our readers back to this Journal, vol. xxvii., pp. 440—442 (May, 1859), for an abstract of the papers of M. Vilmorin upon this subject.
I-10. Quadrupeds of America," vol. ii., p. 239.
I-11. "Proceedings of the American Academy of Arts and Sciences," vol. iv., p. 178.
I-12. Owen adds a third, viz., vegetative repetition; but this, in the vegetable kingdom, is simply unity of type.
I-13. "Contributions to Natural History of America," vol. i., pp. 127—131.
I-14. Op. cit., p. 130.
II-1. To parry an adversary's thrust at a vulnerable part, or to show that it need not be fatal, is an incomplete defense. If the discussion had gone on, it might, perhaps, have been made to appear that the Darwinian hypothesis, so far from involving the idea of necessity (except in the sense that everything is of necessity), was based upon the opposite idea, that of contingency.
III-1. Vide "Proceedings of the British Association for the Advancement of Science," 1859, and London Athenoeum, passim. It appears to be conceded that these "celts" or stone knives are artificial productions, and apparently of the age of the mammoth, the fossil rhinoceros, etc.
III-2. See "Correspondence of M. Nickles," in American Journal of Science and Arts, for March, 1860.