creating
brainpower sufficient to enable the baby to control itself in all its
voluntary movements. We do not think that the fluttering hands and
little kicking feet are really building brains, but this is so. And
all of life's experiences have been building brain for you ever since.

Professor Elmer Gates tells us that only about ten per cent. of our
brains are cultivated, that there is a vast field of brain
possibilities lying undeveloped in each one of us, and that these
possibilities are to be developed through cultivation of the senses.
So while I have been talking to you of the care of your body, I have
been advocating that which will in reality develop mind.

We have learned that certain areas of brain govern certain movements
of body. For example, anatomists know not only where the general motor
area is located, but they can indicate the very spot where any special
motor-force is generated.

In the case of a mill girl who was subject to epilepsy and had pain in
her right thumb at each attack, it was decided to remove the part of
the brain which governed the motions of that thumb. This they could do
because they knew just where that motor-center lies, and yet they were
able to take out no more than that, for when the wound was healed she
had full use of all of her hand except the thumb.

We may know that by exercising a certain organ we are building up a
certain part of the brain. For example, the man who has cultivated his
hearing until he can hear sounds inaudible to ordinary men, has made
for himself more brain-cells in the hearing area. If he has cultivated
his sight assiduously, he has created more visual cells. If his touch
has been cultivated, his brain has received new touch
sensation-cells. And Professor Gates asserts that his mental ability
has been thereby increased. You will be interested in hearing of his
experiments with animals and what he has learned therefrom.

He says he has demonstrated that it is possible to give to an animal
or a human being more brains, and consequently a better use of the
mental faculties. During twelve months, for five or six hours a day,
he trained dogs to discriminate colors. He placed several hundred tin
pans, painted different tints, in the yard with the dogs. At one time
he put their food under pans of a certain tint. When they had learned
to go at once to these pans for their food, he changed the color.
Again he arranged it so that they would receive an electri