This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Published by: Cambridge, London, published for the Society of General Microbiolgy (by) Cambridge U.P. in 1917 in 406 pages; Description: "Most of the material in the following pages was first presented in a series of lectures before classes in Harvard University."--Pref.; Subjects: Science / Chemistry / General; Science / Chemistry / Analytic; Medical / Biochemistry; Health