Bates. The Naturalist on the River Amazon.
Belt. The Naturalist in Nicaragua.
Büchner. Geistesleben der Thiere.
Carter. Annals of Natural History.
Clark. Mind in Nature.
Comstock. The Study of Insects.
Darwin. The Descent of Man; The Origin of Species; Insectivorous Plants; Formation of Vegetable Mould; The Expression of the Emotions; Power of Movement in Plants.
Dewar. Physiological Action of Light, Nature, 1877.
Figuier. Reptiles and Birds.
Furneaux. Life in Streams and Ponds.