Blood is almost synonymous with life itself and so is a subject of vital importance to everyone. Now Dr. Zim has written a much-needed introduction to the study of this life-giving substance, describing the composition of the blood and the processes by which the body makes and uses it.

The expression that "blood is thicker than water," is literally true, for blood contains many complex chemicals essential to the body's health and growth. In the easy-to-follow style for which he is widely known, Dr. Zim tells the reader what some of those chemicals are and what functions they carry out. Red blood cells transport oxygen, white cells fight disease, hormones regulate growth cycles. Other significant topics included are the uses of vaccines and antitoxins and an explanation of blood groups and the Rh factor.

A must for the elementary science classroom, this attractively illustrated book will also be read by all those with an interest in the absorbing field of physiology.

From the dust jacket