Trans. Eoy. l>ubl. Soc, Ser. II., Vol. VII. 



Plate XXI. 



20 



40= 



ChromiuLi Nitrate 



at 16° 



Cr(N03)2-9II=0. 



A violet-c-oloureil 

 salt. 



The same, at 100" 



The colour has 

 changed to green. 



3. 



Chi'Omium .sulijhalc, 

 at 20°. 



Cr23(S04)-15H.O. 



A blue or violet salt, 

 yieldiug a deep 

 blue solution. 



The same, at 100°. 

 The colour Las 



changed to green. 



bolulioa uf Cobalt Chloride iu (jlyeeriue at ditferent 

 temjieratures. 



The spectra of solutious uf Chromium Salts at 

 different temperatures. 



