All normal as well as abnormal individuals are classifiable according to the internal secretions which rule in their make-up.

In the second half of the 19th century, an American physician, Beard, described Neurasthenia, a general disturbance of the body and mind, not properly classifiable as a disease, but serious enough to incapacitate or at least greatly limit the sufferer.

The combination becomes classifiable as the thyroid-pituitary type, or as the thyroid-adrenal type.

A number of life reactions are classifiable as the strivings of endocrine inferior individuals to overcome their sense of inferiority.