Note 92 — Chapter VII
Reading edition
Darwin, Descent of Man; Romanes, Animal Intelligence, Mental Evolution in Animals, Mental Evolution in Man; Lubbock, Senses, Instincts, and Intelligence of Animals, and Ants, Bees, and Wasps; Hartmann, Anthropoid Apes; Büchner, Geistesleben der Thiere; Huber, Natural History of Ants, etc.