Chemical Constitution of Saline Solutions. 



259 



The Spectra of Copper Salts. (Plate XVIII.) 



CuCl2"2H20. — Solutions in water were mixed with hydrochloric acid, and 

 also with calcium chloride, and examined at 20°, 100°, and 130°. A solution 

 mixed with ammonia was examined at 20° and 100°, but it did not change on 

 heating. 



CuBr2'5H20. — An aqueous solution was examined at 20° and 100°. 



Absorption Spectra of Suhstances tvhich are not Crystalline Hijdrates., or are 

 not dehydrated at 100° C. (Plate XIX.) 



