42 The Dancing Mouse 



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. 



Such contradictory statements (and unfortunately they 

 are exceedingly common) stimulated me to the repetition of 

 many of the experiments which have been made by other 

 investigators to test the dancer's behavior in unusual spatial 

 relations. I shall state very briefly the general conclusions 

 to which these experiments have led me, with only sufficient 

 reference to methods and details of results to enable any one 

 who wishes to repeat the tests for himself to do so. For the 

 sake of convenience of presentation and clearness, the facts 

 have been arranged under three rubrics: equilibrational 

 ability, dizziness, and behavior when blinded. To our 

 knowledge of each of these three groups of facts important 

 contributions have come from the experiments of Cyon 

 (9 p. 220), Alexander and Kreidl (i p. 545), Zoth (31 p. 157), 

 and Kishi (21 p. 482), although, as has been stated, in many 

 instances their results are so contradictory as to demand 

 reexamination. All in all, Zoth has given the most satis- 

 factory account of the behavior and motor capacity of the 

 dancer. 



If the surface upon which it is moving be sufficiently soft 

 or rough to furnish it a foothold, the dancer is able to run 

 up or down inclines, even though they be very steep, to cross 

 narrow bridges, to balance itself at heights of at least 30 cm. 

 above the ground, and even to climb up and down on rods, 

 as is shown by certain of Zoth's photographs which are re- 

 produced in Figure 4. Zoth himself says, and in this I am 

 able fully to agree with him on the basis of my own obser- 

 vations, "that the power of equilibration in the dancing 



