COMPOUND SALTS. 415 



of tartrate of potash, the tartrate of silver preci- 

 pitated, after being washed and dried, weighed 

 i c 2-9 grains. Ammonia being dropt into the re- 

 sidual liquid, no immediate change was pro- 

 duced, but after an interval of twenty-four hours 

 the inside of the glass was lined with a deep 

 brown deposite, having a semimetallic lustre, 

 and adhering so firmly to the glass that I could 

 not weigh it with accuracy ; but it certainly 

 amounted to 3 grains. From this experiment I 

 consider the tartrate of silver as a neutral salt, 

 composed of 



1 atom tartaric acid 8-25 



1 atom oxide of silver 14*75 



From the preceding detail, we see that all the 

 salts of silver hitherto examined are anhydrous. 

 Tins is a peculiarity which belongs to no other 

 genus of salts except those of silver. 



SECT. II. 



OF THE COMPOSITION OF THE COMPOUND SALTS. 



THE compounds, usually distinguished by the Nature of 

 name of triple salts, are formed by the union of 

 two simple salts with each other. These two 



