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: The Macmillan Company in 1922 in 414 pages; Subjects: Sanitation; Communicable diseases; Public health; Medical / Infectious Diseases; Medical / Epidemiology; Medical / Health Care Delivery; Medical / Public Health;