on the Protochloride and Peroxide of Mercury. 507 



hi 00-00 



100-00 



It is evident that we have here a body precisely correspond- 

 ing to white precipitate; the mercury, however, being in pro- 

 to-combination. Water of ammonia acting on calomel, abs- 

 tracts half the chlorine, which is replaced by a corresponding 

 quantity of ammonia in some form of combination. We can 

 accordingly construct two formulas corresponding to white 

 precipitate ; in the first, half the mercury being conserved as 

 protoxidized and combined with an atom of ammonia : in the 

 second, that half of the mercury being directly united to ami- 

 dogene. The former theory gives from the formula (Ch + Hg) 

 + (Hg+NH 3 ). 



Mercury 87*00" 



Chlorine 7*59 



Oxygen 1-73 



Ammonia 3*68_ 



and 100 of calomel should yield 97*84? of product; whilst the 

 second, from the formula (Ch + Hg) -f- (NH 2 + Hg) gives, 



Mercury 88-72] 



Chlorine 7'74 M 00*00 



Amidogene 3*54<J 



and 100 of calomel should yield 95-95 of product, which is 

 almost precisely the quantity obtained in experiment. 



We here find the evidence in favour of the existence of 

 amidogene in combination to be almost insuperable. I shall 

 nevertheless retain all through this paper the two methods of 

 expression, until by examining the compounds of the other 

 metals, the differences may become so much larger, as to com- 

 pletely prevent their falling within possible limits of error of 

 observation. 



Of the Action of Ammonia upon Peroxide of Mercury. 



The accurate examination of the action of ammonia upon 



3 T2 



