84 
Proceedings of the Eoyal Society of Edinburgh. [Sess. 
in colour to the normal with wave length, but rapidly to him. Hence his 
difficulties. 
7. This is Ko. 387 of the microscope test. As he obtained the high value of 
12 '5 for the red-green reading in that test, he was not regarded as abnormal 
at the time. But he found difficulty with the colours of the salts in the 
examination, are much better in naming and matching colours in common use than the 
observers on the previous page. 
chemical laboratory, came to me for re-examination, and then, when tested 
with the bead test, put red in the green hole, and hesitated long with pink 
over the green hole before putting it into red. 
When re-examined again one year later with the microscope test, he got 
2 ‘2, 6 ’4, and 6*2 for the red-green reading, values which are abnormally low ; 
and, when examined on this occasion with the bead test, he put peacock-blue, 
dark pink, and pale pink in the green hole. When asked to name spectrum 
