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: Henry G. Bohn in 1846 in 572 pages; Subjects: Biography & Autobiography / Medical; Juvenile Nonfiction / Technology / Inventions; Science / History; Technology & Engineering / General; Technology & Engineering / History; Technology & Engineering / Inventions;