Note 32 — Chapter XVI · CAUSES WHICH INTERFERE WITH THE FREE CROSSING OF VARIETIES—INFLUENCE OF DOMESTICATION ON FERTILITY.
Reading edition
For cats and dogs, etc., see Bellingeri in ‘Annal. des Sc. Nat.,’ 2nd series, Zoolog. tom. xii. p. 155. For ferrets, Bechstein, ‘Naturgeschichte Deutschlands,’ b. i. 1801, s. 786, 795. For rabbits, ditto, s. 1123, 1131; and Bronn’s ‘Geschichte der Natur.,’ b. ii. s. 99. For mountain sheep, ditto, s. 102. For the fertility of the wild sow, see Bechstein ‘Naturgesch. Deutschlands,’ b. i., 1801, s. 534; for the domestic pig, Sidney’s edit. of Youatt on the Pig, 1860, p. 62. With respect to Lapland, see Acerbi’s ‘Travels to the North Cape,’ Eng. translat., vol. ii. p. 222. About the Highland cows, see Hogg on Sheep, p. 263.