A Dissertation on Horses: Wherein It is Demonstrated, by Matters of Fact, as Well as from the Principles of Philosophy, That Innate Qualities Do Not Exist, and That the Excellence of This Animal is Altogether Mechanical and Not in the Blood

"A Dissertation on Horses" by William Osmer is a scientific publication written in the mid-18th century. This work delves into horse breeding and challenges the prevailing beliefs of the time regarding the significance of bloodlines in determining the excellence of horses. Osmer argues that the quality of horses is primarily mechanical, based on their physical conformation rather than inherited blood traits. In this dissertation, Osmer systematically critiques the superstitions surrounding horse breeding in England, particularly the undue emphasis on bloodlines. He provides historical context, including examples from antiquity and the practices of nomadic tribes, to underline his points. Through careful observation and anatomical principles, he claims that the success of a horse in racing stems from its physical structure—such as proportion and symmetry—rather than its pedigree. His discussions touch on various notable horses and breeding practices of both domestic and foreign origins, ultimately advocating for a more rational approach to breeding based on physical attributes rather than an unfounded belief in "innate qualities." Osmer's work is a call for breeders to rely on observation and understanding of horse mechanics to produce superior racers.