The change of attitude that is seen in our day is due chiefly
to two great discoveries: the re-discovery of the human body
and its relation to our mentality and the discovery of the mind
of the child and youth. We have found that man is an animal who
graduated from caves and dugouts and to whom even barbarism was
a lade and great achievement. That the human body was made by
the experiences of that rude life, and that since then we have
made no change in it except to stand on two feet. Neither have
we added one nerve cell or fiber to our brains since the day
when the cave was home and uncooked food the daily diet.

The conception of man as an animal has led to a study of him as
such. Educators as a class now concede that the physical man
must be considered as an essential part of their scheme, that
the brain is an organ of the body among other organs, and is
subject to the same laws and influenced by similar conditions.

The influence of the mind upon the body is a commonplace of
psychology, but the influence of the body upon the mind is of
equal importance, though less frequently emphasized.

Whatever one's theory of the nature of mind, it must be
considered in relation to the brain as the organ of its
expression. The mind has, too, a broader base than the brain,
for every organ of the body has some share in the mental
functions. Every physician knows that physical disease lowers
the quality of the thinking and, with the exception of a few
geniuses like Darwin and Leopardi, it makes impossible
intellectual work of a high order. Disorders of the internal
organs rob the brain of nourishment and weaken it, and by