A scientific study of the medicinal leech, a popular treatment for a range of ailments in the 19th century. Written by James Rawlins Johnson, a physician and naturalist who conducted extensive research on leeches, this work provides a detailed account of the anatomy, behavior, and therapeutic uses of these fascinating creatures. Featuring illustrations and diagrams throughout, as well as a reprint of two seminal papers on the subject from the Philosophical Transactions of the Royal Society, this book is an essential resource for anyone interested in the history of medicine and biology.

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