On the Vision of Colours. 33 
pears to me that of a dull, opake, blackish blue, upon 
a white ground. A solution of-sulphate of iron in 
the tincture of galls (that is, dilute black ink) upon 
white paper, gives a colour much resembling that 
of a florid complexion. It has no resemblance of 
the colour of blood. Red and scarlet form a genus 
with me totally different from pink. My idea of 
red I obtain from vermilion, minium, sealing wax, 
wafers, a soldier’s uniform, &c. These seem to 
have no blue whatever inthem. Scarlet has a more 
splendid appearance than red. Blood appears to 
me red; but it differs much from the articles men- 
tioned above. It is much more dull, and to me is 
not unlike that colour called bottle-green. Stock- 
ings spotted with blood or with dirt would scarcely 
be distinguishable. 
(By candle-light.) 
Red and scarlet appear much more vivid than 
by day. Crimson loses its blue and becomes yel- 
lowish red. Pink is by far the most changed; in- 
deed it forms an excellent contrast to what it is by 
day. No blue now appears; yellow has taken its 
place. Pink by candle-light seems to be three parts 
yellow and one red, ora reddish yellow. The blue, 
however, is less mixed by day than the yellow by 
night. Red, and particularly scarlet, is a superb 
colour by candle-light; but by day some reds are 
VOL. Vv, E 
