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. Original Published by: H. Holt and Company in 1893 in 320 pages; Subjects: Medical / Anatomy; Nature / Plants; Science / Life Sciences / Botany; Science / Microscopes & Microscopy;