Walker, A. (1839). General principles. In A. Walker, Intermarriage: or, The mode in which, and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity result 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 (pp. 257-259). New York, NY, US: J & H G Langley.
http://dx.doi.org/10.1037/11926-014
Mr. Cline appears to have been the first anatomist who called the attention of breeders to the scientific principles of their art. In this respect, he did indeed little; and he certainly had no idea either of the number and importance of these principles, or of the conclusions to be drawn from them. But it was still something to point out the value of a little knowledge of anatomy, and the importance of capacity in the chest of animals. (PsycINFO Database Record (c) 2016 APA, all rights reserved)