Parasites: A Treatise on the Entozoa of Man and Animals: Including Some Account of the Ectozoa

"Parasites: A Treatise on the Entozoa of Man and Animals" by T. Spencer Cobbold is a scientific publication written in the late 19th century. This work explores the fascinating and complex world of parasites, particularly focusing on the entozoa (internal parasites) that inhabit both humans and animals. It aims not only to document these organisms and their effects but also to shift the misconception that such parasites are solely products of disease or a sign of divine disfavor. The opening of the treatise sets the stage for a comprehensive discussion on helminthology, the study of parasitic worms. Cobbold emphasizes the need for an open and unbiased mind to truly appreciate the nature of these organisms, which are often misunderstood. He critiques popular misconceptions surrounding entozoa and posits that these parasites play significant roles in both environmental and biological contexts. Additionally, he outlines his intended approach for the treatise, indicating its systematic arrangement and the inclusion of both historical records and contemporary insights into the existence and roles of these fascinating creatures.