46 Account of Experiments on the Perception of Colour. 
Table I. (continued). 
Equation V. +V. =U) FG. EW. B=0" =a 
1856, Sept. 3. 56 47 28 16 0 53 
4. 57 50 25 18 0 50 
5 56 49 24 20 0 51 
6 55 47 27 18 0 53 
8. 54 49 26 20 0 51 
aa 56 50 27 17 0 50 
Equation VI. +V. +U. +G. —W. -—B. Y=0. 
Sept. 3. 38 27 35 24 76 0 
4. 39 27 34, 24 76 0) 
5. 40 26 34: 24 76 0 
0 
0 
0 
6. \ 
8. 39 28 33 24. 76 
ug I 
"i ee ee ne ES Ee ae eee 
Tasxe II.—The sums of the observed equations. 
Vs U. G. W. B. ve 
Equation I. O +3828 + 81 —198 —407 +191 
ww~ Li.-—361 O —239 + 55 +409 +1386 
ee. II. +129 —341 0 +176 +295 —259 
oe LV. —376 +1038 —224 O +291 +206 
woe )«60 Vw +8384 «=—292 +157 +109 0 —3808 
eee VIL +2383 +163 +204 -—143 —457 10) 
Tasie III.—The averages of the errors of the several equations 
from the means expressed in +35 parts of a circle. 
Equations. I. Il. III. RV: V. WATE 
Errors. 94 "85 1:05 117 1:08 "40 
Taste [V.—The averages of she errors of the several colours 
from the means in ;45 parts of a circle. 
Colours. Vig U. G. W. B. iG; 
Errors. *83 ‘99 80 ‘61 1:15 1:09 
Average error on the whole -92. 
The equations from which the reduced results were obtained 
were calculated as follow :— 
Equation for (W) = (II) + 2(III) + (V) —2(1) —4(VI). 
Equation for (Y)= 20} +2(1) —3 (IIL) + 2(1V) —3(V). 
