158 Intelligence and Miscellaneous Articles, 



of a considerable number of new bodies. The ammoniacal sulphate 

 of zinc crystallized is 



1 — ZWO.SOj -f 2NH3 + 3 HO 



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



2 — zwo.sog + 2 (NH3.H0). 

 which, if heated, gives at 212° F. 



3 — zwo.sog + (NH3.H0.) 



but at dull redness loses still nh^.ho and leaves zwo.sog. 



If No. 1 be exposed longer to a moderate heat it loses 2 ho, and 

 there remains, 



4 — zno SO3 + 2 NH3 + HO. 



If this be heated to 300°, it loses (NH3 ho) and there is 



5 — ZW0.SO3 + NH3. 

 which further gives by heat 



6 — 2 (ZWO.SO3) + NH3 



from which the ammonia cannot be expelled without decomposition. 

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

 formula, it becomes 



(NH3.HO.) SO3 + ZWO. (NH3.H0). 



Now the oxide of zinc from the sulphate being redissolved by pot- 

 ash, there must be formed the similar compound 



K.O.SO3 + ZWO.KO. 



This cannot be obtained crystallized, for if the liquor be evaporated 

 there is deposited KO.SO3, and zreo.Ko remains dissolved ; from this, 

 by exposure to the air, there are gradually deposited small crystals, 

 which Dr. Kane considers as being 



KO.CO2 + Z« O.COj 2 HO. 



but by heat there is carbonic acid given off, and a powder insoluble 

 in water is produced, the composition of which, from Dr. Kane's exa- 

 mination, appears to be 



KO.CO2 4- z«o.cOc2 + 2 z«o. 

 It will be recollected, that the bicarbonate of potash is 



KO.CO2 + HO.COo. 



By treating the ammonia sulphate No. 3 or 5 by water, there is 

 obtained a basic sulphate, having the formula 



zrao.soj + 6 z«o -|- 12 ho. 

 which, dried and exposed to the air, slakes, and gives 



ZBO.SO3 + 6 zwo + 3 HO. 

 This new salt has some remarkable relations to those already known. 

 There are two ammonia chlorides of zinc. 

 No. 1 , in pearly scales of a talcy lustre, consists of 



zw c/ -H 2 NH3 -f HO, 

 and, when heated, gives off NH3.H0. leaving nhs.zwc/. a white 

 powder. 



