Published in 1872, thirteen years after On the Origin of Species, The Expression of the Emotions in Man and Animals is devoted to documenting what Darwin believes is the genetically determined aspects of behavior. Together with The Descent of Man (1871), it sketches out Darwin's main thesis of human origins. Here he traces the animal origins of human characteristics such as pursing of the lips in concentration, tightening of the muscles around the...

The Voyage of the Beagle is the title most commonly given to the book written by Charles Darwin and published in 1839 as his Journal and Remarks, bringing him considerable fame and respect. This was the third volume of The Narrative of the Voyages of H.M. Ships Adventure and Beagle, the other volumes of which, were written or edited by the commanders of the ships. Journal and Remarks covers Darwin's part in the second survey expedition of the ship...