Food, influence of, on the pig, i. 72;
on cattle, i. 91;
excess of, a cause of variability, ii. [257].
Forbes, D., on Chilian sheep, i. 95;
on the horses of Spain, Chili, and the Pampas, i. 52.
Formica rufa, ii. [251].
Fortune, R., sterility of the sweet potato in China, ii. [169];
development of axillary bulbs in the yam, ibid.
Fowl, common, breeds of, i. 225-230;
supposed plurality of origin, i. 230;