Twelve hours of hygiene. By F. L. Meredith, B.Sc., M.D., professor at Tufts College, lecturer on Hygiene at Simmons College. The book contains about 400 pages including 110 illustrations. P. Blakiston & Son Co., publishers. The volume is an abridged edition of Hygiene; a textbook for college students and is intended for use in one‐hour, one‐semester courses in Hygiene for college freshmen