[13] Tropical Nature, p. 210. The italics are ours.
[14] A. H. Sturtevant, Experiments on Sex Recognition and the Problem of Sexual Selection in Drosophila. Journ. Animal Behavior, Sept.-Oct. 1915, vol. 5, No. 5, pp. 352, 353.
[15] In the eland as well as in the reindeer, in which both sexes have horns that begin in the latter at least to develop before the gonads ripen, it is stated that castration does not prevent the development of the horns in the male, but whether they are as large as in the normal male is apparently not definitely stated.
[16] Yarrell also states that after the fallow buck has reached the height of its maturity and has 6 prongs in its antler, removal of one testis causes the next antler to have but 5 prongs.
[17] It might be supposed that this bird was really a cock which had been changed for a hen; but the following facts put this matter beyond a doubt: First, there was no other pyed pea-fowl in the country. Secondly, the hen had knobs on her toes, which were the same after her change. Thirdly, she was as small after the change as before, therefore too small for a cock. Fourthly, she was a favorite bird, and was generally fed by the lady, and used to come for her meat, which she still continued to do after the change in the feathers.
[18] See the latter also for references to Lacertilia and Chelonia.
[19] Carnegie Inst. Wash. Pub. No. 278, 1918.