1799] > : Experiments on Colours. be Lee 
colour in the proportion in which it exifts in the fpeétrum, becaufe any three following 
colours produce on combination only the middle colour, On this fuppofition white 
is produced by | 
EXPERIMENT XVI. 
Indigo 180 == Violet 80 + Indigo 40 + Blue 60. See C2. 
Yellow 135 == Green 60 + Yellow 48 + Orange 27. See C5. 
Red | 45 = Red 45 in the Spectrum, 3 
360 See Table Dr. 
EXPERIMENT XVII. 
Blue 160 = Indigo 40 + Blue + 60 Green 4+ 60. See C3, 
Orange 120 — Yellow 48 4+ Orange 27-+4+ Red +45. SecC 6, 
Violet 380 See the Spectrum. 
360 See Table Dz. 
EXPERIMENT XVIII. M 
Green 168 — Blue 60 + Green 60-+ Yellow 48. SeeC4. 
Red 152 — Orange 27 + Red 45 + Violet 80, See C 7. 
Indigo 40 See the Spectrum. 
360 «©6—s- See Table D 3. 
EXPERIMENT XIX. | 
Yellow 135 — Green 60 + Yellow 48 + Orange 27. SeeCs, 
Violet 165 — Red 45 + Violet 80+ Indigoqgo, See C.1. 
~ Blue 60 = Seethe Spectrum. - 
360 ° See Table Dy. 
EXPERIMENT XX. . 
Orange 120 = Yellow 48 + Orange 27 + Red 45. See C6. 
Indigo 180 = Violet 80 + Indigo 40 + Blue 60. See C2. 
Green 60=_ See the Spectrum. 
360 See Table D 5. 
. EXPERIMENT XXI. 
Red 152 = Orange 27 + Red 45 + Violet 80, See C7. 
Blue | 160 = Indigo 40 + Blue 60 + Green 60. SeeC 3. 
Yellow 48 = See the Spectrum, 
= 

360 See Table D 6, 
EXPERIMENT XXII. 
Violet 165 — Red 45 4+ Violet 80 4+ Indigo 40. See Cr, 
Green 168 = Blue 60 + Green 60 + Yellow 48 See C4. 
Orange 27 = See the Spectrum. 

360 See Table D 7. ‘ 
It follows from what has preceded, that the following combination of colours will 
produce white; vix. begin at any colour in the [pectrum, and take of the 2d a proportion 
or quantity = to the sft, 2d, and 3d; of the sth a proportion = to the ath and 6th; 
and of the 6th == sth and 7th. 
EXPERIMENT XXIII. 
Indigo 180 = to Violet 80 + Indigo 40 + Blue 60 
Yellow 87 = Green 60 + Orange 27 
Orange 93 = Yellow 45 + Red 438. 
Produce 360 White. See Table Ex. 
EXPERIMENT XXIVe 
Orange 120 = to Yellow 48 + Orange 27 + Red 45 
Indigo 140 = Violet 80 + Blue 60 
Blue 100 = Indigo 40 + Green 60 

Produce 360 White. See Table E 2. 
3U2 #XPBRIMERT 
P ! 
