16. By pricking the skin with the point of a needle, you can stimulate
the "pain spots."

17. The sense of taste is sensitive only to solutions that are sweet,
sour, salt, or bitter. Plan experiments to verify this point. What we
call the "taste" of many things is due chiefly to odor. Therefore in
experiments with taste, the nostrils should be stopped up with cotton.
It will be found, for example, that quinine and coffee are
indistinguishable if their odors be eliminated by stopping the nose. The
student should compare the taste of many substances put into the mouth
with the nostrils open with the taste of the same substances with the
nostrils closed.


REFERENCES FOR CLASS READING

COLVIN AND BAGLEY: _Human Behavior_, Chapters VII and XII.

MÜNSTERBERG: _Psychology, General and Applied_, Chapters III, IV, VI,
and VII.

PILLSBURY: _Essentials of Psychology_, Chapters II, III, and IV.

PYLE: _The Outlines of Educational Psychology_, Chapter II.

TITCHENER: _A Beginner's Psychology_, Chapter I, par. 3; also
Chapter II.