184 



latter being deposited on the sides of the glass, from the 

 liquid nitrate of ammonia, gives a mirror surface equal to that 

 obtained by aldehyd. 



On analyzing the ammoniacal compounds of nickel, Dr. 

 Kane found the results of Erdman completely verified ; but 

 from the inferior affinity with which the ammonia was 

 retained, these compounds did not yield as positive results 

 as to their influence on theory, as those of the copper class. 



A new substance, discovered in the course of these re- 

 searches, may be termed a fulminating copper. It is a blue 

 powder, decomposed by heat into metallic copper, water, 

 ammonia, and nitrogen. Its formula is 3cuo -j- 2 nh 3 4- 6 ho. 



The examination of the zinc compounds has lead to the 

 discovery of a considerable number of new bodies. The 

 ammoniacal sulphate of zinc crystallized is 



1 — zt?o.so 3 + 2nh 3 + 3 ho 



exposed to the air, it efflorescences losing ho, and becomes 



2 — ZWO.SO3 -4- 2 (nh 3 .ho). 

 which, if heated, gives at 212° F. 



3 — ZWO.SO3 4-(nh 3 .ho.) 



but at dull redness loses still nh 3 .ho and leaves zrao.so 3 . 



If No. I be exposed longer to a moderate heat it loses 

 2 ho. and there remains, 



4 — zno so 3 4- 2 nh 3 + ho 



If this be heated to 300°, it loses (nh 3 ho) and there is 



5 — zrao.so 3 4- nh 3 . 

 which further gives by heat 



6 — 2 (zwo.so 3 ) 4- nh 3 



from which the ammonia cannot be expelled without decom- 

 position- 

 Selecting from among these No. 2, for reduction to its 

 rational formula, it becomes 



(NH3.H0.) so 3 4- zwo. (nh 3 .ho> 



