502 



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



G. was tested for light sense in the apparatus described in the 

 previous memorandum. 

 Light disappeared with 



It thus appears that the final sensitiveness to light of the central 

 part of the eye was nearly 12 times less than a person possessing 

 normal sense. 



Case V. This was a remarkable case, which Mr. Nettleship had 

 mentioned to the Committee. He had stated that this lady, N. W., 

 mistook blue for red, and it was with some curiosity that this case 

 was examined. Her first examination was as to colour sense with the 

 spectrum colours, a patch of mono-chromatic light being placed in 

 juxtaposition with an equal patch of white light. At 62'5 (X 6890) 

 of the scale the red of the spectrum disappeared. As the slit moved 

 along the spectrum, and the white was approximately reduced to equal 



