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 GeneralBooksClub.com. You can also preview excerpts from 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. Volume: 5; Original Published by: Williams & Wilkins in 1920 in 389 pages; Subjects: Botany; Nature / Plants; Science / Life Sciences / Botany;