Agassiz, L., on conscience in dogs; on the coincidence of the races of man with zoological provinces; on the number of species of man; on the courtship of the land-snails; on the brightness of the colours of male fishes during the breeding season; on the frontal protuberance of the males of Geophagus and Cichla; male fishes hatching ova in their mouths; sexual differences in colour of chromids; on the slight sexual differences of the South Americans; on the tattooing of the Amazonian Indians.
Age, in relation to the transmission of characters in birds; variation in accordance with, in birds.
Agelaeus phoeniceus.
Ageronia feronia, noise produced by.
Agrion, dimorphism in.
Agrion Ramburii, sexes of.
Agrionidae, difference in the sexes of.
Agrotis exclamationis.
Ague, tertian, dog suffering from.
Ainos, hairiness of the.