1921

In The Glands Regulating Personality: A Study of the Glands of Internal Secretion in Relation to the Types of Human Nature, a best-seller, Louis Berman “proposed that human beings be categorized in various types, so-called ‘master types,’ according to their respective endocrinal complexion. Thus there were those who were thyroid gland-centered, pituitary gland-centered, adrenal gland-centered and so on” (Nordlund, 92).