184 Prof. J. Brocklesby on the Influence of Color on Dew. 
results of peeanen’ observation, detected this fallacy ; for in 
the perusal of the following pages it will be seen, that where dif- 
ferent oe matter was employed, the white and yellow main- 
tamed no such superiority in the scale of colors. 'The material 
of color therefore is not to be disregarded in this enquiry. 
In the further prosecution of this investigation, five small pie- 
ces‘of plate glass were procured, cut from the same strip of equal 
size, their weights being rendered alike by the addition of small 
fragments from the same plate. They were next painted on one 
side with water-colors, as follows: 
| Nos. | Substance. | olor. 
a p : 3 . | Gamboge. 7 ellow 
Re 52 Tae Bk Blue and Gamboge. Green. 
3, j ; . | India Black. 
4, stores 7 Flake White. White. 
5, ‘ : ; . | Prussian Blue. Blue. 
In every color the paint was not spread quite uniformly over 
the surface, it cae found impossible to blend the shades into 
one unvarying ti int. 
e plates were placed side, by side upon a board, and expo- 
sed, in the first and second experiments, upon the basi of a house, 
and in the third upon an open grass plot. After each experiment, 
if any defect of coloring appeared, the plates tes retouched. 
The results were as follows: 
~|_Ast.—Aug. 12th. | Qa. 8d. — Ag. 3th. Ag Tah 
% Toe 3 Bi ge o a 
Be | 2 [tlie] .& | et u ~» | =! 
Ms | oF | ASlas | at |oelaz | ae |.o& 
inches.|pwts. grs.| grs. jinches.'pwts. grs.| grs. inches. ae .grs.| grs. 
Yellow, 5-06 | 9 14-5] 13:5 | 5-06 |. 14°5 +5 | 5-06) 9 14: 65 
n, ieee * 6 13-5 sew se iD g “6 6:5 
oat, és a, « [905] «wp ge %. 4 ee 
White, Pek “ te tk ar PT} “ 55 é “es vo 
Blue, a: “ fiat | 135 Th «| 65 “ hue, pas 
Arranging the colors according to the quantity of dew gained, 
the following orders are uiat : ‘ 
+ 
2 _——__#___. 
S Ast Exp. i« tsp.” | 3d Exp 
hite. car m ~ White, Blu r 
Yellow, Green, Blue, Yellow, Green. 
Black. : Yellow, Blue. Black. 
sa a oe hee ‘tials 
The average gain of the several Siew, arranged as above, is 
seen in the annexed scale. 
es z dies 
——— 
— 9-2 
Blue, ; F 9- 
Yellow, White, : . 8-8, 
’ Black, *. 8-3 
