150 The Dancing Mouse 



that they do not readily discriminate between these 

 colors. 



The experiments on color vision which have been described 

 and the records which have been presented will suffice to 

 give the reader an accurate knowledge of the nature of the 

 results, only a few of which could be printed, and of the meth- 

 ods by which they were obtained. 



In brief, these results show that the dancer, under the con- 

 ditions of the experiments, is not able to tell green from blue, 

 or violet from red. The evidence of discrimination furnished 

 by the light blue-orange tests is not satisfactory because the 

 conditions of the experiment did not permit the use of a suffi- 

 ciently wide range of brightnesses. It is obvious, therefore, 

 that a method of experimentation should be devised in which 

 the experimenter can more fully control the brightness of the 

 colors which he is using. I shall now describe a method 

 in which this was possible. 



