4 
Bulletin of the Natural History Society. 
To ascertain what one of the new conditions might be, a few 
experiments were made, of which I give you the result. 
Three glass test tubes were used, each holding about an ounce 
of fluid. When equally filled, they were first placed in a vessel 
of water until they all showed the same degree, about 64 ° F. 
The air ranged at 65 °. The three tubes were then exposed to the 
direct rays of the sun. One tube was filled with a black solution 
of India ink. Another with a solution of iodine, the color of 
brandy ; the third with a light yellow fluid. 
FIRST EXPERIMENT. 
India Ink. 
Iodine. 
Y ELLOW. 
After the 1 st 5 m 
72 
69 
68 
“ 2 nd “ 
73 
70 
69 
“ 3rd “ 
74 
72 
72 
“ 4 th “ 
... 76 
74 
73 
SECOND EXPERIMENT. 
First tube black, the second blue, from sulp. copper, the 
yellow tinge. 
Black. 
Blue. 
Yellow. 
5 m 1 st observation 
72 
69 
68 
2 nd 
74 
72 
70 
THIRD 
EXPERIMENT. 
Black. Yellow Ting*. 
Water. 
1 st observation 
72 
70 
69 
2 nd “ 
75 
72 
70 
25 m 3 rd “ 
80 
74 
72 
45 4 th “ 
80 
75 
74 
1.30 5 th “ 
... 84 
76 
76 
The black tube caused a shadow like any solid substance not 
transparent, the iodine solution a modified one, and the third still 
less. In the third experiment, when water was used, the shadow 
was slight, showing the passage of the light through the tube and 
water. In the three experiments, the heating of the black liquid 
was more rapid and decided, and in the third experiment, when 
one tube contained the ink, the second water, and the third water 
slightly tinged with the yellow, the black tube showed a decided 
susceptibility, 
