Wells's principles and applications of chemistry; . n Association forthe Advancement of Science, in 1857, stated that during the seven years ending in 1856,there were at Montreal, 918 days on which rain and snow fell; and during the like period,there were 816 days on which ozone was present in the air in appreciable quantity. QxTKBTioiN-s.—Under what circumstances is ozone noticed in the atmosphere ? Whatinfluence is ozone supposed to have in the economy of nature? What is said respectingthe daily consumption of oxygen ? How are gases not absorbed by water collected ? De-scribe the pneumatic t
Wells's principles and applications of chemistry; . n Association forthe Advancement of Science, in 1857, stated that during the seven years ending in 1856,there were at Montreal, 918 days on which rain and snow fell; and during the like period,there were 816 days on which ozone was present in the air in appreciable quantity. QxTKBTioiN-s.—Under what circumstances is ozone noticed in the atmosphere ? Whatinfluence is ozone supposed to have in the economy of nature? What is said respectingthe daily consumption of oxygen ? How are gases not absorbed by water collected ? De-scribe the pneumatic trough. MANAGEMENT OF GASES. 19T the shelf will be covered by it to the depth of aboutan inch. (See Fig. 86.) Another and more elegantarrangement, constructed of glass, and suitable for Ja lecture table, is represented by Fig. 87. Thevessel intended for the reception of gas is filled withwater, inverted and placed upon the shelf of thepneumatic trough, with its mouth directly over theperforation in it. The extremity of the gas-delivering Fig. Fig. 87.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
