One of the most interesting results of this study of the direction of turning, from the observer's point of view, is the demonstration of the fact that the truth concerning even so simple a matter as this can be discovered only by long and careful observation. The casual observer of the dancer gets an impression that it turns to the left more often than to the right; he verifies his observation a few times and then asserts with confidence that such is the truth about turning. That such a method of getting knowledge of the behavior of the animal is worse than valueless is clear in the light of the results of the systematic observations which have just been reported. But, however important the progress which we may have made by means of systematic observation of the phenomenon of turning, it must not for one moment be supposed that the whole truth has been discovered. Continued observation will undoubtedly reveal other important facts concerning circling, whirling, and the periodicity of dancing, not to mention the inheritance of peculiarities of dancing and the significance of the various forms of activity. CHAPTER IV BEHAVIOR: EQUILIBRATION AND DIZZINESS Quite as interesting and important as the general facts of behavior which we have been considering are the results of experimental tests of the dancer's ability to maintain its position under unusual spatial conditions--to climb, cross narrow bridges, balance itself on high places. Because of its tendency to circle and whirl, to dart hither and thither rapidly and apparently without control of its movements, the study of the mouse's ability to perform movements which demand accurate and delicate muscular coördination, and to control its expressions of activity, are of peculiar scientific interest. That observers do not entirely agree as to the facts in this field is apparent from the following comparison of the statements made by Cyon and Zoth (31 p. 174). Cyon states that the dancer Cannot run in a straight line, Cannot turn in a narrow space, Cannot run backward, Cannot run up an incline, Cannot move about safely when above the ground, because of fear and visual dizziness, Can hear certain tones. Zoth, on the contrary, maintains that the animal Can run in a straight line for at least 20 cm., Can and repeatedly does turn in a narrow space, Can run backward, for he has observed it do so, Can run up an incline unless the surface is too smooth for it to gain a foothold, Can move about safely when above the ground, and gives no signs of fear or dizziness, Cannot hear, or at least gives no signs of sensitiveness to sounds.