502 THE OUTGO OF ENERGY 



(1) That he must not speak during the test. 



(2) That the skeins are not to be fingered or 

 tossed about. A skein should be touched only 

 after its selection. 



(3) That he must endeavor to pick out skeins 

 resembling the test skein, i. e. t a little lighter or 

 darker in shade ; the resemblance cannot be per- 

 fect, as no two shades are exactly alike. 



Green Test. The subject must pick out all 

 the other skeins approximately the same shade. 



The color-blind selects some shade of gray. 



Purple (Rose). The subject should pick out 

 the skeins of the same color, as before. 



(1) He who is color-blind by the first test, and 

 who, upon the second test, selects only purple 

 skeins, is incompletely purple-blind. 



(2) He who, in the second test, selects with 

 purple' only blue and violet, or one of them, is 

 completely red-Hind. 



(3) He who, in the second test, selects with 

 purple only green and gray, or one of them, is 

 completely green-blind. 



Remark. The red-blind never selects the 

 colors taken by the green-blind, arid vice versa. 

 Often the green-blind places a violet or blue 

 skein by the side of the green, but only the 

 brightest shades of these colors. This does not 

 influence the diagnosis. 



