I love photography books. Especially odd little finds. I got this book from eBay for $7.00. It was published for the Kodak company in 1907. It is neat to read up on the latest photographic information, processes, recipes and gear from a century ago. Gum-bichromate, camera description, rundown on the Uniform System for aperture designation (U.S. 4, U. S. 8, and so on). Light being measured with light sensitive papers such as Kodak's Solio paper. Velox prints. An article by Alfred Stieglitz 'Simplicity In Composition' in all of his eccentric glory. I just love old photography books.