34 The Dancing Mouse 



and entirely unexpected new facts which this method of 

 observation revealed to me. 



First, there are three kinds of dancers : those which whirl 

 almost uniformly toward the right, those which whirl just 

 as uniformly toward the left, and those which whirl about 

 as frequently in one direction as in the other. To illustrate, 

 No. 2 of Table 2 may be characterized as a "right whirler," 

 for he turned to the right almost uniformly. In the case of 

 the 6 P.M. count, for example, he turned 285 times to the right, 

 not once to the left. No. 152, on the contrary, should 

 be characterized as a "left whirler," since he almost always 

 turned to the left. From both of these individuals No. 210 

 is distinguished by the fact that he turned now to the left, now 

 to the right. For him the name "mixed whirler" seems 

 appropriate. 



Second, the amount of activity, as indicated by the number 

 of times an individual turns in a circle within five minutes, 

 increases regularly and rapidly from 9 A.M. to 8 P.M. Ac- 

 cording to the general averages which appear at the bottom 

 of Table 2, the average number of circles executed by the 

 males at 9 A.M. was 89.8 as compared with 207.1 at 8 P.M. 

 In other words, the mice dance more in the evening than 

 during the day. 



Third, as it appears in a comparison of the general aver- 

 ages of Tables 2 and 3, the females dance more than the 

 males, under the conditions of observation. At 9 A.M. the 

 males circled 89.8 times, the females 151.0 times; at 8 P.M. 

 the males circled 207.1 times, the females, 279.0 times. 



Fourth, according to the averages for the six counts made 

 with each individual, as they appear in Table 4, the males 

 turn somewhat more frequently to the left than to the right 

 (the difference, however, is not sufficient to be considered 

 significant) ; whereas, the females turn much more frequently 



