WATERS from ICELAND. ii£ 



heat in two china cups, carefully wafhing every drop of them 

 from the glafles into the cups with diftilled water, and then 

 taking out the dry extracts out of the cups, I put them fepa- 

 rately into fmall filtrating papers, and palled diftilled water 

 through them repeatedly, until all the faline matter was wafhed 

 away. The papers being then carefully dried, I found the earth 

 in them exceedingly fpungy, fine and tender. The quantity of 

 it, obtained in this Mate from the gr. 10,000 of Rykum water, 

 was gr. 3.8, which were reduced by the action of an obfcure 

 red heat to gr. 3.73 nearly. From the fame quantity of the 

 Geyzer water, I got gr. 6.8 of the dried earth, which, by a fi- 

 milar heat, were reduced to gr. 5.4, and thefe gr. 5.4 being di- 

 gefted with aquafortis, and again wafhed with diftilled water, 

 to extract any argillaceous earth that might remain in them, I 

 obtained only gr. o. 1 of this earth, which added to the quan- 

 tity obtained before, makes up gr. 0.48 of the argillaceous 

 earth, from the gr. 10,000 of Geyzer water, the remaining 

 gr. $.$ being pure liliceous earth. Some of it Was melted into 

 a perfect: glafs in the platina fpoori, with one half of its weight 

 of aerated foflil alkali evaporated to drynefs. The diminution 

 of the weight of the dried earth, from gr. 6.8 to gr. 5.4, which 

 happened when it was gently calcined, proceeded from fome 

 inflammable matter, which adhered to it at firft, and gave it a 

 yellowifh colour. This colour changed firft to black, and af- 

 terwards to a pure white, during the calcination. The inflam- 

 mable colouring matter might have been received in part from 

 the veflels in which the water was brought, fome of which 

 were tainted with the odour of fpirituous liquors, or the water 

 might have got a part of it from fubterranean ftrata of clay, or 

 other earths containing inflammable matter. 



P 2 Experiments 



