WATERS from ICELAND. — I1g 
heat in two china cups, carefully wathing every drop of them 
from the glaffes into the cups with diftilled water, and then 
taking out the dry extraéts out of the cups, I put them fepa- 
rately into fmall filtrating papers, and pafled 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 ftate 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. 0.1 of this earth, which added to the quan- 
tity obtained before, makes up gr.o.48 of the argillaceous 
earth, from the gr.10,000 of Geyzer water, the remaining 
gr. 5.3 being pure filiceous earth. Some of it was melted into 
a perfect glafsin the platina fpoori, with one half of its weight 
of aerated foffil 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. 
Pi 2 . Experiments 
