A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . de deduire de leurs proportions en poids : ce qui donnelieu a une maniere de se representer les corps, qui doivent se combiner,sous des volumes relatifs a Ietat de gaz. Les degres de combinaisonssont absolument les memes, et ce qui dans Iune est nomme atome, estdans Iautre apelle volume^ — Berzclius, vol. iv., p. 549. PRINCIPLES OF COMBUSTION. 139 binations of which the elements of atmospheric air are suscepti-ble,
A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . de deduire de leurs proportions en poids : ce qui donnelieu a une maniere de se representer les corps, qui doivent se combiner,sous des volumes relatifs a Ietat de gaz. Les degres de combinaisonssont absolument les memes, et ce qui dans Iune est nomme atome, estdans Iautre apelle volume^ — Berzclius, vol. iv., p. 549. PRINCIPLES OF COMBUSTION. 139 binations of which the elements of atmospheric air are suscepti-ble, and the extraordinary changes of character and propertieswhich accompany the changes, in the relative quantities alone,of the combining elements. For instance, oxygen unites chemically with nitrogen in fivedifferent proportions, forming five distinct bodies, each essentiallydifferent from the others, thus : Atoms. Weight. Atoms. Weight. Gross Weight. of Nitrogen 14 unites with 1 of Oxygen 8 forming Nitrous Oxide . 22 ({ it {( it 14141414 (I a <( a c: (C 2345 (( Cl a 16243240 li II a Nitric Oxide . 30Hyponitrous Acid 38Nitrous Acid . 46Nitric Acid ... 54 Or thus:. Atmospheric Air. Nitrous Oxide. ....Nitric Oxide. „Hyponitrou8 Acid, Nitrous Acid. Nitric Acid. 140 HEATING. A description of the properties of these distinct t)oJ^<*5 may befound in any chemical work of authority, and I only mentionthese unions to exemplify the importance of attending to theproportioJis in which bodies unite; as we here find the very ele-ments of the air we breathe, by a mere change in the pi-oportionsin which they are united, forming so many distinct substances,from the laughing gas, nitrous oxide, up to that most powerfuland destructive agent, nitric acid, commonly called aqua-fortis. This case of the combination of nitrogen and oxygen alsoshows the importance of the distinction between mechanical andchemical union ; these two elements being only mechanicallyunited in forming atmospheric
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