The human body is the most marvelous machine ever known, but many of its functions are hidden from sight. You cannot see your hear beat. You cannot see how your lungs work, or how you digest food, or how your muscles enable you to move.

This absorbing book explains how the human body is put together and how its various parts function in relation to one another.

Says the New York Times: "Bernard Glemser has been successful in his explanations of even the most complicated processes of the body."

Says the Library Journal: "An outstanding contribution to elementary physiology. Recommended for all school and public libraries. Will be very popular with both boys and girls."

Says the Horn Book Magazine, "A clearly, simply written, well-organized description of the workings of the human body. The illustrations are also clear and simply drawn, increasing the usefulness of the text. The last chapter, dealing with human reproduction, is a model of clarity and dignity."

From the dust jacket