J^Iiiieral PFalers at Cheltenham. 91 



which belonged to the lime water employed in the former 

 experinieut. 



Experiment XXXITT. — ^The residue which had resisted 

 the action of highly rectified alcohol (Experiment XXX.) 

 was transferred into a flask, containing a mixture compoied 

 ofonepartof alcohol and three of water, digested for six 

 hours, filtered, and evaporated to dryness. 



ETperiment XXXIV. — Upon the dry mass four parts of 

 cold vvater were atfused, and suffered to stand for two davs ; 

 which dissolved she whole, e.xccpt four grains which were 

 found to be sul|)hate of lin)e ; this was added to the inso- 

 luble residue left in Experiment XXXIII. 



Experiment XXXV. — ^The watery solution obtained in 

 the preceding cxperunent became milky by lime water: it 

 was thenlore conccntralcd by evaporation as much as pos- 

 sible, and then decomposed whilst boiling hot, by a solution 

 of carbonate of ammonia. The precipitated magnesia weighed 

 76'i grains, which are equal to 3172 grains of sulphate of 

 magnesia; of which salt 4 8-l grains exist therefore in 231 

 cubic inclies of the sulphuretted water. 



Experiment XXXV'I. — The fluid left in the last process 

 having been again concentrated, was mingled with nitric 

 acid in excess, and then decomposed by a solution of ni- 

 trate of barytes : the precijVitate (taking 170 grains of sul- 

 phate of barytes to be equal to 100 of sulphate of soda,) 

 proved that 53 grains of sulphate of soda were present iu 

 231 cubic inches of the sulphuretted water ; allowance being 

 made for that portion of sulpliuric ac'd which belonged to 

 the sulphate of magnesia decomposed in Experiment XXXV. 



Experiment XXXVII. — Into the fluid freed thus from all 

 the sails, wiih a base of sulphuric acid, sulpliate of silver 

 was dropped, till no further cloudiness ensued : tlie obtained 

 precipitate being weighed, indicated the presence of lti3^ 

 grains of nuiriate of soda in 231 cubic inches of the water j 

 taking 233 qf muriate of silver to be ecjual to 100 of muriate 

 of soda. 



Experiment XXXVIII. — The insoluble residue of Experi- 

 ment XXXIII was repeatedly boiled in large quantities of 

 diatilled water, until this fluid ceased to become turbid by 



hvdralc 



