Darwin from Descent of Man to Emotions under Domestication" which went on sale on 30 January 1868. He now published his ideas on human evolution and on how beautiful but apparently impractical features could have evolved in "The Descent of Man, and Selection in Relation to Sex". After revising "The Origin of Species" as the definitive 6th edition, his major works on species culminated in "The Expression of the Emotions in Man and Animals". This period was followed by extensive work on insectivorous plants and research into worms. Despite Darwin's concerns that his children were weakened as his wife Emma Darwin was his cousin or had inherited
The Constitution of Man The Constitution of Man The Constitution of Man (or more completely, The Constitution of Man Considered in Relation to External Objects) first published in 1828 is a work by George Combe, who is credited with popularizing the science of Phrenology. Combe argues that the human mind is best understood through Phrenology, and that the relative size of the various regions of the brain defined by Phrenology determines a persons behavior and potential interactions with the external world. In "The Constitution of Man" Combe uses Phrenology to create a practical science of morality, proposing that conforming to Natural Laws leads to