4 its 



Capt. W. de W. Abney. Examination for [May 14, 



Their appreciation of light was 



Abney 

 P .... 

 Q.... 



Right eye. 

 . 23 

 . 23 

 15 



Left eye. 

 25 

 16 

 15 



We may take it that P's right eye has the same appreciation 

 light as the standard, and his left 1*5 times that of the standard, 

 is 1*6 times that of the standard with both eyes. The luminosit 

 curves were taken with both eyes open. 



The cnrve is very remarkable, showing an intense excitement by 



the blue rays of the spectrum, the whole of which appears of one 



olour to both brothers. The maximum luminosity is about E, but 



