The Expression of the Emotions in Man and Animals allows cultural factors only an auxiliary role in the shaping of expression. This biological emphasis leads to an appreciation of the universal nature of expression, with its implication of a single origin for the entire human species; and Darwin points to the significance of emotional communication with children in their psychological development. Darwin sought out the opinions of some leading British psychiatrists, notably James Crichton-Browne, in the preparation of the book which forms his main contribution to psychology. Amongst the innovations with this book are Darwin's circulation of a questionnaire (probably inspired by his cousin, Francis Galton) in his preparatory
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