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 Supremacy of the Moral Sentiments and Intellect," Combe goes on to argue that the moral sentiments are superior to those that men share with animals, and that the faculties "are right only when directed by "enlightened" intellect and moral sentiment..."they must be illuminated by knowledge of science and of moral and religious duty,"" or else the result is evil. A delicate balance of the expression of the faculties is required for man's happiness. In Section five, "The Faculties of Man Compared with External Objects," Combe identifies specific faculties and their effects on the eternal world. For example, with Philoprogenitiveness, the