This is a surprisingly interesting and thorough discussion of bones. Dr. Samachson includes many aspects related to the subject, from evolution of bone to the latest theories on bone growth and electromagnetism. His material is not tightly organized, but in the discussion of complex living systems, this is a nearly impossible task. Two chapters are devoted to glandular activity but the resultant information is rather vague. The author's love of humor (e.g. De Hevesy sprinkling radioactive salts of thorium on his boarding house hash) and his delight in puns and literary allusions make his account readable.