66 



RESEARCHES ON THE 



of these metals exhibit no analogy to those of cobalt. With chromium the case 

 may be different, but we cannot as yet pronounce with certainty on this point. 

 Experiments with nickel failed entirely, and yielded only ammonia-salts of the 

 protoxide. 



The behavior of ammoniacal solutions of pi'oto-salts of iron and manganese 

 toward the mixture of gases which we have denoted by the formula NO x is worthy 

 of notice. When tartaric acid is added to a solution of proto-chloride of iron or 

 manganese, and after the addition of a large excess of ammonia, a rapid current of 

 NO x is passed through the solution, the liquid soon becomes dark colored, and after 

 a time the whole of the iron or manganese is precipitated as a dark brown or nearly 

 black flocky substance. The filtrate is free from the metal employed. No ammonia- 

 iron or ammonia-manganese base is, however, formed under these circumstances. 



In order to afford a general view of the results of our investigation, we will here 

 give a table of the formulas of the bodies which we have analyzed, or whose 

 constitution has been inferred from analogy of crystalline form. 



Chloride 



Chlorplatinate 



Sulphate 



Nitrate 



Hydrous nitrate 



Oxalate 



Ferridcyanide 



Cobaltidcyanide 



Chloride 



Chlorplatinate 



Acid sulphate 



Oxalate 



Acid oxalo-sulphate 



Neutral oxalo-sulphate 



Roseocobalt. 



. 5NH7Co 2 .C1 3 +2HO. 



. 5NlCCo 2 .Cl 3 +3PtCl 2 +8HO.(?) 



. 5NH7Co 2 .0 3) 3SQ 3 +5HO. 



. 5NlCCo 2 .0 3 ,3N0 3 . 



. 5NH7Co 2 .0 3 ,3NO s +2HO. 



. 5NlCCo 2 .0 3 ,3C 2 3 +6IIO. 



. 5NlCCo 2 .Cy 3 +Fe 2 Cy 3 +3HO. 



. 5NH 3 7Co 2 .Cy s +Co 2 Cy 3 + 3IIO. 



Purjmreocobalt. 



. 5NlCCo 2 Cl.Cl 2 . 



. 5NH 3 ?Co 2 Cl.Cl 2 +2PtCl 2 . 



. 5NlCCo 2 0.0 2 ,4SO+5HO. 



. 5NH7Co 2 0.0 2 ,2C 2 3 -l- 3H0. 



. 5NH7Co 2 0.0 2j 2C 2 3 ,2S0 3 +3IIO. 



. 5NlCCo 2 0.0 2 ,Co0 3 ,S0 3 +7HO. 



Chloride 

 Iodide . 

 Bromide 

 Chlorplatinate 



Luteocdbalt. 



CNlCCo 2 .Cl 3 . 

 CNlCCo 2 .I 3 . 

 6NlCCo 2 .Br 3 . 



6NH37Co 2 .Cl 3 +3PtCl 2 +21HO. 

 " +6H0. 



