Data on Colour-Blindness. 113 



IV. 48i Y. + 51£ Ult.= 70 Vermilion +30 Wh. 



V. 42i Y. + 57i Ult. = 66 Carmine +34 Wh. 



VI. 42i Y. + 571 Ult. = 68£ Brunsw. gr. +31i Wh. 



VII. 20 Y. + 80 Ult. = 65 Blue verditer + 35 Black. 



VIII. 50 Y. + 50 Blk. =100Orangechrome. 



IX. 23 Y. + 58 Blk. + 19 Wh. = 100 Emerald green. 



X. 23i Y. + 761 Blk. = 100 Vermilion. 



XL 10 Y. + 90 Blk. = 99 Carm.+l Wh. 



XII. 91 Y. + 87J Blk. + 3 Wh. = 100 Brunsw. green. 



XIII. 70 Ult. + 30 White = 100 Blue verditer. 



XIV. 73 Emerald gr. +27 Ult. = 70^ Blk. + 29i Wh. 

 XV. 73 Vermilion +27 Ult. = 83J Blk. + 16 J Wh. 



XVI. 86 Carmine +14 Ult. =93 Blk.+ 7 Wh. 



XVII. 87 Brunswick gr. + 13 Ult. =90 Blk. + 10 Wh. 



XVIII. 68 Blue verditer +32 Y. =51 Blk. + 49 Wh. 



XIX. 84 Verm. + 16 White = 85 Emer. gr. + 15 Blk. 



XX. 75 Carm. + 10Y. + 15 W. = 76 Emer. gr. + 24 Blk. 



XXI. 96Carm.+ 4 White = 100 Brunsw. gr. (nearly). 



Mr. Simpson. 

 (Experiments by Prof. Clerk Maxwell.) 



I. 42 Y. + 58Ult. =69 Blk. + 31 Wh. 



III. 56 Y. + 32 Ult.+ 12 Wh. = 100 Em.gr. 



IV. 47 Y. + 53 Ult. =70 Verm. + 30 Wh. 

 IX. 33 Y. + 45 Blk. + 22 Wh. = 100 Em. gr. 



X. 13 Y. + 82 Blk. + 5Wh. = 100 Verm. 



XIV. 68Em.gr. + 32 Ult. = 60 Blk. -} 40 Wh. 



XV. 85 Verm. +15 Ult. = 88 Blk. + 12 Wh. 



XIX. 96 Verm. + 4 Wh. = 31 Em.gr. + 69 Blk. 



Mr. Lloyd. 



(With which John Dalton's vision may probably 

 approximately agree.) 



1.40 Y. + 60Ult. = 65 Blk. + 35 Wh. 



III. 57 Y. + 43 Ult. =100 Em. gr. 



IV. 44 Y. + 56UH. = 71 Verm. + 29 Wh. 

 IX. 28 Y. + 46 Blk. + 26 Wh. = 100 Em. gr. 



X. Si Y. + 86iBlk.+ 5 Wh. = 100 Verm. 

 XL 4| Y. + 95| Blk. = 1 00 Carmine. 



XII. 12 Y. + 88 Blk. =100 Br. gr. 



XIV. 70 Em, gr. + 30 Ult. = 65 Blk. + 35 Wh. 



XV. 89 Verm. +11 Ult. = 89 Blk. + 11 Wh. 



Phil Mag. S. 5. Vol. 34. No. 206. July 1892. I 



