& 
178 An Analysis of two Mineral 
inodorous by exposure to the atmosphere. I have 
obtained no more than four cubic inches of gaseous 
fluids from a wine-gallon of the water. OF these 
hardly half a cubic inch is absorbed by water; and, 
1. Nitric acid dropped into this solution causes a 
minute precipitate of sulphur; hence, some hepatic 
gas has been expelled by the boiling. 2. I put 
some of the water, which had not been boiled, into a 
bottle, leaving a part of the bottle empty: I then 
filled the bottle entirely with lime-water, and stop- 
pedit. A white precipitate fell, which, with the ad- 
dition of distilled vinegar, effervesced sensibly, 
but not strongly. The half cubic inch is, there- 
fore, mostly carbonic acid. 3. Into the portion 
of the air which was not absorbed by water, I 
plunged a lighted candle; it was instantly extin- 
guished. This portion is, therefore, azotic gas. 
Il. THE SPONTANEOUS PRECIPITATE. 
~ A sediment falls to the bottom, and adheres to 
the sides of the bath. It is of a yellow colour, and 
acquires additional brightness from exposure to the 
atmosphere. A similar sediment may be separated 
by boiling the fresh water. From a gallon of water, 
-75 Of a grain is procured. This dissolves readily 
in acids; and shews all the common and well known 
appearances of oxyd of iron. It must have been 
united with the carbonic acid, which has been al- 
ready detected, (1 2.). 
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