av4 Hartiey—The Action of Heat on the Absorption Spectra and 
At 40°, the red rays, like bands of red light, have blended, and appear to have 
retired to the upper part of the liquid where the layer is thinnest. The opacity of 
the liquid has greatly increased by rise of temperature. 
At 85°, measurements were made at D, \ 598; the rays were absorbed as far as 
\ 588, and then transmitted to 423. The red rays transmitted near B were only 
very dimly seen. 
At 100°, measurements were made at \ 581, and at the extremity of the 
spectrum 423. A dark band was situated about \ 581. 
Cobalt Bromide, CoBr.6H,O.—Aqueous solution, saturated at 20° C., of a 
purple colour. Thin wedge, gas-light. This solution absorbs moisture from the 
air. It was found that 6°592 gers. of the hexahydrate CoBr,6H,0 dissolve in 
2:129 grs. of water at 16° C., or the salt is soluble in about one-third of its 
weight of water. Another experiment gave 9°6819 ers. in 2:955 grs. of water, 
the specific gravity of the solution being 1°6284 at 16°:3 C. 
r 
At 16°C. . Raystransmitted from . ; ‘ : : 753 
to . : : ; : 741 
Absorption Band, : : . : . 681 to 598 
Spectrum ends at ; : : é 6 512 
At 100°C. . Rays transmitted from . : : : : 581 
to 545 
The liquid was almost opaque ; measurements made with difficulty. 
Cobalt Bromide, CoBr,,6H,O0.—Solution in alcohol, of a blue colour. Thin 
wedge cell, sunlight. X 
At 16°C. . Rays transmitted from . : ' , : 753 
to . : : : : 741 
Absorption Band, é 5 ; : . 6831 to 598 
Rays transmitted from. : : ; 598 
Spectrum ends at : : ; ; ; 512 
At 100°C. . Rays transmitted from . 3 : : : 581 
eee eure <5 ty 
Solution almost opaque. 
Cobalt Bromide, CoBr..H,O.—Glycerine solution. Thin wedge cell. Purple 
colour. d 
At 16°C. . Rays transmitted from . ; : ; ; 741 
but feebly to. : : . : 124 
Rather more strongly to . . 5 : : 685 
Feeble Absorption Band, : : . . 685 to 536 
Rays transmitted from . : : 3 : 536 
to end of Spectrum at . : . : . . 478 
At 100°C. . The solution is unchanged. 
Cobalt Bromide, CoBr.6H,0.—Dissolved in absolute alcohol. A freshly pre- 
pared solution of a blue colour. Thin wedge. 
