ME. W. POLE ON COLOUE-BLINDNESS. 
Yellow side of the Neutral. 
(II.) 
62 
Y.+ 
38 
Ult. 
= 78 
(III.) 
51 
Y.+ 
49 
Ult. 
= 88 
(IV.) 
481 
Y.+ 
Ult. 
= 70 
(V.) 
421 
Y.+ 
571 
Ult. 
= 66 
(VI.) 
421 
Y.+ 
571 
Ult. 
= 681 
Orange chrome + 22 White. 
Emerald green +12 Wh. 
Vermilion +30 Wh. 
Carmine + 34 Wh. 
Brunswick gr. + 31^ Wh. 
(yellow shade) 
333 
JBlue side of the Neutral. 
(VII.) 20 Y. + 80 TJlt. = 65 Blue verditer + 35 Black. 
Now as all colours on the yellow side of the neutral are to me only shades of yellow, 
it follows that they may all be matched more directly by yellow only, darkened with 
black or grey as the match of intensity may require. The following are the equations 
thus produced : — 
(VIII.) 50 Y. + 50 Blk. = 100 Orange chrome. 
(IX.) 23 Y. + 58 Blk. + 19 Wh. = 100 Emerald green. 
(X.) 231 Y. + 761 Blk. = 100 Vermilion. 
(XI.) 10 Y. + 90 Blk. = 99 Carmine + 1 White. 
(XII.) 9^ Y. + 87^ Blk. + 3 Wh. = 100 Brunswick green. 
And similarly for the blue ; — 
(XIII.) 70 mt. + 30 Wh. = 100 Blue verditer. 
All the yellow colours may be neutralized by adding blue, and the blue ones by 
adding yellow. The following are the equations : — 
(XIV.) 
73 Emerald gr. 
+ 27 Ult. 
= 701 Black 
+ 291 White. 
(XV.) 
73 Vermilion 
+ 27 Ult. 
= 831 Blk. 
+ 161 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 Yellow 
= 51 Blk. 
+ 49 Wh. 
The following are some equations of red and green matched with each other : — 
(XIX.) 84 Vermilion + 16 White — 85 Emerald gr. + 15 Blk. 
(XX.) 75 Carmine + 10 Y. + 15 Wh. = 76 Emerald gr. + 24 Blk. 
(XXI.) 96 Carmine + 4 White = 100 Brunsw. gr. (nearly). 
The different classes of equations above given may be compared theoretically with eacli 
other. An example will best show how this is done. 
Take equation (III.) for emerald green, and add to both sides as much yellow as 
will neutralize the 49 parts of ultramarine, which, from equation (I.), is found = about 
31 parts. Then 
51 Y. + 49 Ult. + 31 Y. = 88 Em. gr. + 12 Wh. + 31 Y. 
2 Y 
MDCCCLIX. 
