Contents: Physiological ecology: its debt to reptilian studies, its value to students of reptiles; The vocabulary of reptilian thermoregulation; Temperature, physiology, and the ecology of reptiles; Field studies of body temperatures and thermoregulation; Physiological control of body temperature; Sensory, neural and hormonal aspects of thermoregulation; Biophysical modeling in reptilian physiology and ecology; The use of water; Skin structure and permeability; Patterns of evaporative water loss; Field studies of water relations.