on ducks, i. 279, ii. [262];
characters of domestic goose, resembling those of Anser albifrons, i. 288;
whiteness of ganders, i. 288;
variations in goldfish, i. 296-297;
assumption of male plumage by the hen-pheasant, ii. [51];
effect of castration upon the cock, ii. [51]-[52];
breeding of the skylark in captivity, ii. [154];
plumage of the male linnet in confinement, ii. [158];
on the dingo, ii. [263].
Yellow fever, in Mexico, ii. [276].