Chemical Constitution of Saline Solutions. 
279 
IPARSIO JODL, 
The Action of Heat on the Absorption Spectra of Chromium Salts. 
| r 
Green Chromium Chloride.—Thin wedge- At 20° Spectrum begins at | 724 
cell. Gas light. | First Absorption Band, | 704 to 685 
A solution of Cr,03°16H,O in hydro- Second _,, 55 673 to 5388 
chloric acid. Not precipitable by Spectrum ends, 500 
ammonium oxalate. 
At 100° Liquid nearly opaque. No 
measurements possible. 
Chromium Sulphate, Cr23(S0,):15H,0.— At 20° Spectrum begins a little below 
Blue or violet salt. Thin wedge-cell. B, 2 687, : 691 
Deep blue solution. Rays transmitted to 610 
Absorption Band, 610 to 566 
Rays transmitted to 475 
At 100° Spectrum begins at 666 
Rays transmitted to 627 
Absorption Band, 627 to 573 
Spectrum ends at : : 497 
| (See figs 3 and 4, Plate X XI.) 
Green Chromium Sulphate, At 16° Rays transmitted from 520 
Cr,3(SO,):5H,O.—Produced from the Wo 465 
violet salt by heating to 100°. No well defined spectrum. 
Violet Chromium Sulphate, At 16° Spectrum begins at 662 
Cr.3(SO,)'15H,0.—0°5 gr. in 4 c.c. of Rays transmitted to 562 
20. Absorption Band, 562 to 525 
Spectrum ends at 423 
| At 100° Spectrum begins at 662 
Rays transmitted to 577 
| Absorption Band, 577 to 526 | 
| Spectrum ends at 444 
Green Modvfication, Cr,3(SO,)5H,0O.— | At 16° Spectrum begins at 662 
0-5 gr. in 4 c.c. of H,0. Rays transmitted to 575 
Absorption Band, 575 to 526 
Spectrum ends at 442 
Chrome Nitrate, Cr(NOs)3°9H,0.—Vio- At 16° Spectrum begins at 715 
let coloured salt. Rays transmitted to 627 
Absorption Band, 627 to 557 
Spectrum ends at 449 
At 50° Spectrum begins at 715 
Rays transmitted to 627 
Absorption Band, 627 to 557 
Spectrum ends at 464 
At 100° A little light transmitted be- | 
tween 0 0. o_o _ || BAB & HOO 
(See figs. 1 and 2, Plate X XI.) 
2Q 2 
