Dr Kellogg on...
The hydriatrist...must be thoroughly acquainted with the language of disease, with all its pathological processes, and must be familiar with the conditions of health as expressed in human physiology. No hydric application... is safe or likely to prove successful unless made with the full knowledge of the patient's condition at the moment, and in harmony with the physiological and therapeutic principles involved in (this) particular case... Routine treatment is always bad enough, but in hydric practice it is absolutely dangerous alike to the reputation of the physician and to the comfort and possibly even the life of the patient. 421