'Contributions to the Theory of Natural Selection' is a series of essays on evolutionary theory, that include 'Mimicry, and Other Protective Resemblances Among Animals, 'The Philosohy of Birds' Nests', 'Creation by Law', and more.

'On the Varieties of Man in the Malay Archipelago' is an article on the distinct characteristics of humans inhabiting the Malay Archipelago.

'Are Individually Acquired Characters Inherited?' is an essay that discusses the important question of whether traits acquired during an organism's life are passed on to the next generation.

This work by Alfred Russel Wallace was originally published in 1895 and it is now republished with a brand new introductory biography. 'Natural Selection and Tropical Nature Essays on Descriptive and Theoretical Biology' is a collection of essays that detail Wallace's observations of various bird species and outlines some of his ideas relating to evolutionary theory.

Written by a famed 19th-century scientist who laid the groundwork for much of modern biology, this influential work remains one of the great classics of natural history and travel. Detailing his eight-year exploration of the Malay Archipelago, Wallace offers observations of the native people of the island groupings, the abundant and strange animals and insects, and more.

'On the Tendency of Species to form Varieties' is a landmark article on Wallace's ideas of natural selection in relation to evolutionary theory.

This work by Alfred Russel Wallace was originally published in 1890 and it is now republished with a brand new introductory biography. 'Human Selection' is an essay on the future of human evolution in relation to Darwin's suggestion that natural selection was having a reduced or non-existent effect on modern humanity.

'On the Zoological Geography of the Malay Archipelago' is an article detailing Wallace's observations during his travels in Asia.

'Monkeys' is an article that appeared in Popular Science Monthly and details the characteristics and geographical distribution of many species of monkey.

'Darwinism Applied to Man' contains an account of of the general identity of human and animal structure, diseases common to man and other animals, summary of the animal characteristics of man, and other aspects of evolutionary theory.