by Rawitz, by Panse, by Baginsky, by Alexander and Kreidl, and by Kishi--
Cyon's theory of the relation of the semicircular canals to space
perception--Condition of the auditory organs--Condition of the
equilibrational organs--Condition of the sound-transmitting organs--The
bearing of the results of anatomical investigations upon the facts of
behavior.


CHAPTER VI

THE SENSE OF HEARING

Experiments on hearing in the dancer made by Rawitz, by Panse, by Cyon, by
Alexander and Kreidl, by Zoth, and by Kishi--Hearing and the voice--
Methods of testing sensitiveness to sounds--Results of tests with adults--
Importance of indirect method of experimentation--Results of tests with
young--The period of auditory sensitiveness--Individual differences.


CHAPTER VII

THE SENSE OF SIGHT: BRIGHTNESS VISION

What is known concerning sight in the dancer--Brightness vision and color
vision--Methods of testing brightness vision, the visual discrimination
apparatus--Motives for discrimination and choice--Punishment versus reward
as an incentive in animal experiments--Hunger as an incentive--An electric
stimulus as an incentive--Conditions for brightness vision tests--
White-black vision--Evidence of preference--Check experiments--Conclusion.