■60 Dr. Kane on the Compounds of Ammonia. 



2.544, dried, gave 1.957? from whence 



Dry sub-sulphate zz. 75.88 



Water = 24.12 



The dry mass, exposed to the air, absorbed water, and became 2.137? or 8.40 per 



cent., having taken up almost exactly one-third of the quantity of water it had 



lost. 



These results point out the formula 



SO3 -|- 6z^^o -j- 10 HO, 

 which should give 



SO3 = 40.16 10.79 



6zwo = 241.80 65.02 



10 HO = 90.00 24.19 



371.96 100.00 



There are two sub-sulphates of zinc already known, of which the one 

 SO3-}- 4z?20 has been described by Schindler, Kuhn, and Graham. It appears to 

 combine with variable proportions of water, from two to ten equivalents, but 

 most commonly is to be found with four. The second has been examined by 

 Schindler alone, who gave its formula as sOj-j- 8zno -\- 2 ho. I have not had an 

 opportunity of verifying this result, but I consider the correctness of his analysis 

 as being very probable. The same chemist showed that there may be formed a 

 soluble compound of SO3 -j- 2 zno, which, however, is destroyed when dried. 

 Hence the series of basic sulphates of zinc may be thus arranged : 



Real neutral sulphate = zno . so,. 



Salt with saline water = (zrao.Ho) SO3. 



Soluble salt of Schindler = (zwo . zwo) SO3. 



Common crystals = {zno . ho) so3-|- 6 ho. 



Hyperbasic salt, dry = (zno .zno)so3-\-Qzno. 



Common basic salt, dry = (zwo . zwo) so3-|-2zrao. 



Do. with water — Schindler = {zno . zno) . SO3 4- 2 zno -\- 2 ho. 



New basic salt, dry = {zno . zno) SO3-I- 4z»o. 



Do. with water = {zno . zno) SO3 -\-4:zno -{- 10 ho. 



The law of replacement being precisely what was already shown in the copper 

 series, but still more complete from the discovery of sOj-f- 6z«o. 



