The following conclusions were obtained as a result of applying Urine Quotient 0/K₃ to 36 subjects exposed to experimental high temperature environments. It was found that the subjects fell under 2 categories. The first group consisted of 14 subjects with low 0/K₃ values which indicated an extremely high resistance to body water loss and inorganic substance, especially sodium loss. This group was designated as a group showing a picture of compliance of the living body under high temperature environments. The second group consisting of 22 showed abnormally high 0/K₃ values, indicating a considerably weaker resistance to body water loss and inorganic substance loss as opposed to the first group. This group was designated as a group showing a picture of non-compliance of the living body to high temperatures.