This is the 5th edition of this interesting book by William Boyd who was a professor of pathology and bacteriology of the University of Toronto in Canada. This is the fifth edition and has 500 Illustrations and 30 colored plates. It is an introduction to medicine. This is a hard covered book with over 1000 pages and no dust jacket. I actually like the look of this book just for the patina and character. This type of book looks great on bookshelves for display.