104 Mr. Horner o« /y&<? Brine Springs at Droltwlch, 



purple hue throughout. It now weighed 339.63 grs. which is 

 equal to 64.7 grs. of acid, taking the composition of muriate of 

 silver to be 19.05 acid and 80.95 base, according to the deter- 

 mination of Dr. Marcet, and which, from its close coincidence with 

 that of Gay Lussac, appears most entitled to confidence. 



B. To separate the Earthy Muriates^ 



a. Three* ounce measures of the brine, weighing 1628.4 grs. 

 were evaporated to dryness in a heat not exceeding 200", and 

 which was reduced to 180° towards the close of the operation. 

 The residuum was reduced to powder, and again exposed to a 

 heat of about ISO* until no farther moisture was given off. It 

 now weighed 431.86 grs.f 



b. This residuum finely powdered, I put into a flask, and poured 

 on it two ounce measures of alcohol nearly boiling. It stood forty- 

 eight hours, during which time it was frequently shaken. It was 

 then filtered, and the salt left on the filter was washed with two 

 ounces of fresh hot alcohol. 



c. The filtered liquor was evaporated to dryness in a very 

 gentle heat, and a small quantity of fresh alcohol was added to 

 the residuum, to separate the earthy muriates from the muriate of 

 soda taken up by the alcohol in the process b. This was filtered, 

 and the liquor being evaporated to dryness yielded 0.32 gr. of 

 residuum. 



* As all the other salts, besides the mariatc of soda, were shewn by the preliminary 

 experiments to exist in comparatively small quantities, I used a larger proportion of 

 the brine in the determination of these, to avoid as much as possible the errors of 

 too minute manipulations. 



t So that the brine contains 26.53 per cent, of salt. 



