Spectrum and the Primary Colour Sensations. 59^ 



Fiff. 3. 





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1 



1 





Eye fatigued Vvith 



ASZOyU 











Normal 





045 































■040 































035 

 030 

 025 

 020 





1 











/ x 





1 



I 



X 



\ 

 I 

 u 











/ / 

 / / 

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/ ' 





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\\ 

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1 



/ / 



/ 

 / 

 / 

 f 





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> 



c 



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1 * 

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1 1 









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// 

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1 * 

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f 





•015 









NU_^j^ 







■40/1 -45 -50 -55 -60 -65 -70 .75 

 Wave Length. 



The corresponding curves tire shown in fi^ 5 alu | f} \ 6* 

 Both are of the same type, and exhibit t wo elevations 

 similar to those in thr. curve for the wave-leng)], \ 589 it in 

 fig. 8. As these measurements are tedious to mafc Q I yielded 

 to the temptation to determine these curves, and a few others v 

 as will be noticed, only for those parts where experience shows 



