he effects of
the internal secretion lacking or insufficient. Thus the effects of
cocaine may be compared with the effects of thyroid. But while there
is a normal mechanism for thyroid detoxication, the cocaine or heroin
derivatives mark the tissues permanently with their scars and deform
the personality.

THE HYGIENE OF THE INTERNAL SECRETIONS

All these protean expressions of endocrine determination may now begin
to be looked upon with the hopeful and optimistic attitude of him who
understands cause and effect and can control. The advances made in the
last ten years in the practical manipulation of the ductless glands
from without, the introduction of glandular extracts by feeding or
injection, and the modification of their structure and function by
surgery, the X-ray and radium, and other procedures, enable us
to regard more confidently the problems hitherto accepted as the
insoluble and intricate handiwork of Fate. Fate may have woven the
patterns of our being. But as we commence to probe the machinery and
to examine the looms more carefully, we begin to understand why the
wheels creak, and why there are seconds and odd lots in the product as
well as the rare and precious firsts. Moreover, we are learning how to
handle the machinery ourselves. The abdication of Fate can therefore
be confidently expected in due time.

However, we have yet to begin, and we can begin with prevention. The
theory of Adler, that some organ inferiority is responsible for much
unhappiness in life has received much advertisement in conjunction
with the doctrines of the Freudians. It is a theory of little scope
when applied to the eyes, ears, heart and so on because only a small
minority of the cases are of that kind. But as we have seen, a
deficiency of an internal secretion, an endocrine inferiority,
reverberates throughout all the cells. Not only the mind, but all of
the members of the organism must strain and co-operate to make up for
the break in the balance.

Endocrine inferiority is indeed the most frequent organic inferiority.
And we may explain a number of mental types upon that basis. Thus the
inferior gonado-centric, who has something wrong with his reproductive
organs, will evolve in one of two directions. If his adrenal and
thyroid are of poor quality, he will become the secluded introvert,
shut off from the interests of normal life. He will enter the
borderland of insanity if pituitary difficulties supervenes. If, on
the c