The paramount importance of the blood is vividly illustrated in the terse text by Isaac Asimov, prolific writer of books for the layman on scientific subjects. With his usual gift for entertaining as he edifies, Isaac Asimov analyzes the chemical components of the blood and shows its relationship to other manifestations in the universe. He then points out the genetic considerations which determine blood characteristics, various diseases, specifically related to morbid blood traits, and the healthy function of the blood. A book which gives much insight into the physical nature of the body and to the prospects of science in dealing with it therapeutically.