Note on the Resemblances and Differences in the Structure and the Development of the Brain in Man and Apes

The Different Forms of Flowers on Plants of the Same Species

Insectivorous Plants

The Variation of Animals and Plants under Domestication — Volume 1

The Voyage of the Beagle by Charles Darwin

On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life