Note 31 — Chapter XVI · CAUSES WHICH INTERFERE WITH THE FREE CROSSING OF VARIETIES—INFLUENCE OF DOMESTICATION ON FERTILITY.
Reading edition
Quoted by Isid. Geoffroy St. Hilaire ‘Hist. Naturelle Générale,’ tom. iii. p. 476. Since this MS. has been sent to press a full discussion on the present subject has appeared in Mr. Herbert Spencer’s ‘Principles of Biology,’ vol. ii., 1867, p. 457 et seq.