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Proceedings of the Koyal Society of Edinburgh. [Sess. 
separate colour sharply divided off from blue. It will be noticed how good 
she is at the blue corner of the diagram. 130 patches. 
6. I had always regarded this observer as decidedly colour blind. When shown 
a row of books on a shelf he names their colours fairly accurately, except 
2, 3, and 4 are normal; 5 has exceptionally good colour vision, and sees indigo as a separate 
colour ; 6 and 7 are strongly “colour different” ; 8 is the woman student with the worst 
colour vision out of 249 tested ; 9 and 10 are slow, hut more accurate at naming colours 
than 6 or 7. 
the greens, which appear colourless to him, though he may risk calling them 
brown or yellow. When examined by the bead test, he put green into red ; 
yellowish green and brown into yellow ; pink, peacock-blue, and dark pink 
into green, in addition to other less important mistakes. When examined 
with the colour-perception spectrometer he got 15 patches, which is about 
normal, but he called the range 5500-5200 A.U. “yellow with a slight tint 
of green.” There is no doubt whatever that he would fail decidedly in 
the Board of Trade examination. 
