The nucleus of this book is a series of lectures given to the students at the American College of Neuropathy by Dr. William McKie in 1915-1916, when he was a teacher of Hydrotherapy at that institution. The book is dedicated to all earnest workers in the healing arts. Dr. McKie was a graduate of the Bernarr Macfadden Institute. Bernarr Macfadden founded The Physical Culture Hotel in Dansville, New York. It was the leading institution of the world devoted to the practice of natural methods. This amazing book describes the physics of water, air, heat and light in relation to hydrotherapy.