Chemical Constitution of Saline Solutions. 
The Spectra of Copper Salts. 
209 
(Plate XVIII.) 
Aqueous Solutions. Temperature. Rays transmitted. REMARKS. 
Centigrade. r 1 
CuS0,°5H,0, At 20° From 667 
5 ‘a : 100° », 665 
Cu(NO;).°3H,0, 20° » 639 All the yellow, green, and blue 
55 100° » C8 transmitted. 
CuCl,:2H,0, 20° », 098 to 468 
5 3 80° », 085 — 478 
fe) 
Rar carn in glycerine, ; a ai Bie i fae ) The alcoholic solution was of a 
1 x ‘ 100° CRO = ANY yellowish green colour; that of 
Solution in alcohol, 20° , 659449 | glycerine grass-green; but on heat- 
750° 659 — 477 ing it became similar in colour to 
a y ie ¥ J the solution in alcohol at 20°. 
CuCl,:°2H,O.—Solutions in water 
also with calcium chloride, and examined at 20°, 100°, and 130°. 
were mixed with hydrochloric acid, and 
A solution 
-mixed with ammonia was examined at 20° and 100°, but it did not change on 
heating. 
CuBr,"5H,O.—-An aqueous solution was examined at 20° and 100°. 
Absorption Spectra of Substances which are not Crystalline Hydrates, or are 
not dehydrated at 100° C. 
Aqueous Solutions. 
(Plate XIX.) 
Temperature. 
REMARKS. 
CrO;, 
Cr0;, 
K,Cr,0,, 
(NH,),Cr,0;, 
K,CrO,, 
2Ce(NO,)4KNO,"3H,0, 
oe) : 
9 
Pa(NH,).Cl,. 
PdK,Cl, 
KaCly 
K,8;, 
i : j F ; ‘ 
Prussian blue dissolved in 
oxalic acid. 
A mixture of ferric chlorideand 
potassium sulphocyanate. 
Centigrade. 
) 
16° 
Rays transmitted. 
Xr Xr 
696 to 676 
691 — 685 
696 — 558 
691 — 565 
711 — 588 
696 — 537 
685 — 555 
679 — 557 
730 — 498 
706 — 504 
676 — 508 
696 — 517 
730 — 565 
730 — 569 
730 — 560 
724 — 565 
649 — 470 
643 — 477 
730 -— 519 
730 — 545 
533 — 451 
540 — 451 
724 — 604 
667 — 568 
Thin wedge-cell. 
? ? 
Thick wedge-cell. 
Faint band at A 582, probably due 
to didymium. 
Thin wedge-cell. 
” ) 
9 oh) 
A dull spectrum. 
Thin wedge-cell. 
” ” 
Dilute solution. 
Thin wedge-cell. 
Intensely dark solution. 
therefore diluted. 
It was 
