Human physiology an elementary text-book with special emphasis on hygiene and sanitation This book, "Human physiology an elementary text-book. 1929", by John W. Ritchie, is a replication of a book originally published before 1915. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.