Chemical Constitution of Saline Solutions. 
The Examination of Cobalt Salts. 
The Spectrum of Cobalt Chloride, CoCl,6H,0. Aqueous Solution. 
Thin wedge-cell. Sun-light. Cre YOK No ») 
Temperature. Description of Spectrum. r | 
Sorurron RED— 
At 23°C. Spectrum begins about the solar line a, or 724 | 
Rays extend to 679 
Absorption Band from D to beyond F, or » from 588 to 468 
The spectrum extends as far as the visible rays 
near h, or. 407 
to the limit of visibility. | 
SoLurIoN PURPLISH RED— | 
At 38° C. Spectrum begins at a, or 724 
Absorption Band from rather below. B towards 
C, with a further extension by reason of 696 to 673 
another band developing, to. 662 
| Principal Adsorption Band from below D to 
| | between F and G, : : : : 619 to 449 
| End in the blue at 407 
: : | at L ae G3! 
SoLurion PURPLE— 
At 48° C. | Spectrum begins at a, or 724 
Absorption Band trom below B to a ‘little 
towards C, . 696 to 681 
There is an extension of the band to about C, or 665 
| A further extension is seen between C and D, 
| or to . 619 
| From the sharp edge of the band the diffused 
rays extend, too feeble to admit of the cross- 
| wires being visible. Absorption Band extend- 
ing as In previous case to near G. 
Spectrum ends in the blue, or the limit of visi- 407 
bility. 
| a = ee ee 7 
SoLvrrion PURPLE— 
At 53° C Red rays visible at or about 615 
Absorption Band extends from 615 to near G, 615 to 449 
In the thinner part of the cell an Absorption 
Band between C and D is clearly visible. 
SoLurrion BLUE— 
At 78° C. Red rays are visible at. 627 
A little light is transmitted about 589 
Great Absorption Band, . 589 to 449 
In the thinner part of the cell two distinct 
absorption bands were seen. | 
SoLutTIon BLUE— 
At 93° C. Barely a glimmer of red rays was let through 
about D, and that only in the thinnest part 
of the cells. 
