OF SILVER. 41 1 



in the 43 grains of nitrate it was obviously com- 

 posed of 



Oxide of silver 29-5 or 14-75 



Arsenic acid . 9'72 - 4-86 



39-22 



14*75 represents an atom of oxide of silver, but 

 4*86 is less than an atom of arsenic acid by 2-89, 

 which is rather more than the third of an atom. 

 We see from this, that the arseniate of silver, 

 (like the phosphate) when obtained by precipi- 

 tation, is not an accurate atomic compound ; it 

 is doubtless a mixture of two or more arseniates 

 in different states of saturation. It is composed 

 of 



1 atom arsenic acid . 7 -75 



1 atom oxide of silver . 14-75 + 8-771 



8*771 exceeds half an atom by only 1-396; 

 hence, it is obvious that the greater part of the 

 precipitate is a subsesquarseniate of silver, com- 

 posed of 



1 atom arsenic acid . 7-75 



1J- atom oxide of silver 22-125 



* 



29-875 



With this subsesquarseniate there is mixed a 

 small portion of di-arseniate of silver. 



. 



