118 4n ANALYSIS of 
In gr. 10,000 of Rykum water there are, 
Of cauftic foffil alkali, - oF..O.51 
Argillaceous earth, - - 0.05. 
Siliceous earth, - - 373 
Common falt, - - 2.90 
Glauber’s falt when exficcated, - 1.28 
Total, 8.47 
In gr. 10,000 of Geyzer water, 
Cautftic foffil alkali, - gr. 0.95 
Argillaceous earth, - - 0.48 
Siliceous earth, - - 5-40 
Common falt, - 2.46 
Glauber’s falt exficcated, - 1.46 
Total, 10.75 
THeEseE quantities of the ingredients, as determined by the 
above experiments, exceed the quantities of dry extract which I 
obtained by evaporation. Gr.'10,000 of the Rykum water gave 
by evaporation gr. 8.25 of dry extract, and the fame quantity of 
Geyzer gave gr. 10 only. This difference, however, can eafily 
be accounted for. It is well known that common falt, and 
other falts, fuffer fome lofs by evaporation, when watery folu- 
tions of them are evaporated to drynefs ; and the odour which 
was perceived in the end of the evaporation of thefe waters, 
made me fufpedt that a little of the falt might have been loft. 
There was therefore no reafon to expect that the refult of the 
analytical experiments would tally exactly with the extract by 
evaporation. I was rather furprifed and pleafed to find that 
they 
