in the Isle of Wight, Q35 



of this residue being treated with muriatic acid and oxalat of ammo- 

 nia, oxalat of lime was precipitated ; and another portion being treated 

 with neutral carbonat of ammonia and phosphat of soda, some mag- 

 nesia was precipitated in the form of triple phosphat, circumstances 

 which confirmed the presence of lime in the form of selenite, and 

 that of magnesia, In the form of sulphat or Epsom salt. 



2. The alcoholic solution being evaporated to dryness, a yellowish 

 deliquescent residue was obtained, which, being dried at 160° 

 weighed 0,9 grains. Water being added to this residue, a small 

 portion of it remained undissolved. The filtered watery solution 

 was yellowish, though perfectly transparent, and being examined by 

 the usual reagents, appeared to contain iron, sulphuric acid and mu- 

 riatic acid, with imponderable vestiges of lime and magnesia, with- 

 out any trace of alumine. 



3. From these circumstances. It was Inferred that the only deli- 

 quescent salts yielded by the residue, in ascertainable quantities, were 

 sulphat of Iron, and murlat of iron, both of which had probably 

 been formed in consequence of some new orders of attraction taking 

 place during the process of evaporation to which the water had been 

 subjected.* 



§ XII. Sulphat of Magnesia, 



1. The presence of magnesiaf was ascertained beyond all doubt, 

 in the following manner : 



50 grains of residue minutely pulverized, were boiled In a 

 solution of neutral carbonat of ammonia, so as to decompose all the 



* Namely, the red sulphat from the hyper-oxygenatioii of the iron, and the muriat from 

 the decomposition of muriat of soda, as will be explained hereafter. 



+ The presence of this earth in the form of sulphat had already been proved by the ap- 

 plication of alcohol, (§xi. 1), 



2 G 2 



