Limb by limb, organ by organ, occasionally cell by cell, Asimov describes man in terms of his chemical and structural nature. Throughout, technical terminology is followed by an informal phonetic breakdown and etymological identification. There is an unusually lucid and sympathetic discussion of the circumstances of human procreation. A companion volume on the brain, nervous system and sensory organs is promised. For those hypochondriacal theme writers who always pick some anatomical obscurity, Asimov goes from impacted wisdom teeth to ingrown toenails.