Itis not yet established whether the adrenal cortex normally secretes several hormones or just one hormone with different actions. The results of studies on adrenocorticotropic hormone (ACTH) (1-3) have on the whole been consistent with the hypothesis that the cortex produces three types of hormone: one affecting carbohydrate metabolism ("sugar" or "S" hormone), one affecting sodium and potassium metabolism ("salt" or "Na" hormone) and one with somatotropic and androgenic properties ("nitrogen" or "androgenic" hormone).As evidence for the first, the "sugar" hormone, ACTH produces the metabolic changes that one would expect from the combination of protoplasmic breakdown and glycogen deposition (3); it also produces glycosuria and hyperglycemia, and a fall in blood lymphocytes and eosinophils.As evidence for the second, the "salt" hormone, on the first day of giving ACTH, and often before the other changes are apparent, there is a large loss of potassium, quite out of proportion to the breakdown of protoplasm calculated from the nitrogen loss. Extracellular fluid (ECF) is also retained, as estimated from chloride changes. Sodium is retained in amounts greater than one would expect from the amount of chloride retained, and some of it probably replaces potassium lost from the cells (3,4).