Intermarriage or the mode in which, and the causes why, beauty, health and intellect, result from certain unions and deformity, disease and insanity, from others; demonstrated by delineations of the structure and forms, and descriptions of the functions and capacities, which each parent, in every pair, bestows on children, in conformity with certain natural laws, and by an account of corresponding effects in the breeding of animals with eight illustrative drawings by Alexander Walker.