GAS. 
In the 2d vol. of the apna d’Arcueil, Gay Luffac has 
two = eflays, the one on the combination of gafeous 
{ubftances one with an noice ae the other on nitrous vapour 
and sts ous gas, in which he advances anhypothefis that ga- 
feous fubftances always combin: with each other, either in 
equal volumes, or in volumes which are {mall fimple multi- 
ples one of the other. For inftance, he argues that 100 mea- 
aoe of oxy genous pas united with 2co meafures of nitrous 
gas, conftitute nitric acid, and with 300 meafures of nitrous 
gas, nitrous acid.- Now every one, who has had experience 
on this fubject, knows that 100 meafures of oxygen are con- 
180 of nitrous gas or lefs, i 
es hae is this aci cannot, ac- 
cording to Gay | » be either the nitric or nitrous 
Again, by proper wrcatment, 100 meafures of oxygen may 
be.made to unite with 320% 340, or 360 nitrous gas, by pres 
oe two thin ftrata of the gafes to each other over water 
a wide veffel. rer as a 
ies 140 and 360 meafures of nitrous gas may eafily be 
united with the oxygen, there is not any apparent reafon for 
peak 200 and 300 meafures of hnitrous gas as forming the 
nly definite compounds. Gay Luffac has given a table ana- 
logous to the above, founded on his hypothefis, but our pro- 
portions differ very materially from thole of his table, and we 
have no doubt as to bioiate ups perior accuracy in genera J, as they 
are refults of e 
all conclude ae ar ide with the following table of 
the bone of certain combuftible gafee and oxygen, 
which a rie the electric {park in Volta’s eudiomaeter, and 
the produéts formed. 
3—TABLE 7 
Of the Combination of combuitible Gafes with Oxygen, and the Preduds. 
“Vicalures of Meafures Meafures 
pure Gas. oxygen. carbone acid, 
1c0 Carbonic oxyd, uniteto - - - - 47 |jprodués - -  - 94 
too Carburetted hydrogen - - - = - - 200 |——_—_——= - -  1cO + he 
100. Olefiant gas - = 2 = -  - 285 - - = I 
100 Sulphuretted hydrogen - - = = - 150 |—— - - - - 100 fulphucou acid + water | 
100 Phefphuretted hydrogen - = = - 150 - - - a a cid + water 
Ico Ammoniacal gas - - - - 67 - - - - 2 +. water 
Gas, in Agriculture and V. egetable Economy, an aeriform 
fluid mea which is fuppofed to be taken up as the food 
of plants. There are fea kinds that are believed to be 
ufeful in this w es as the = ae carbonic acid gas, 
&c. See Foon of Plants ea TATION. 
Gas Light, oa (er produ The light and heat 
procured ay mbuttion of carbine seit hydrogen gas, 
hich 
is one of thofe recent ventions mifes to be of the 
lal a sa aad ari ba a view to determine the beft 
aia an or producing the gas, at ae bs aft ex- 
pen eet ae = the dition, and at the fame time to fe- 
para apes it thet 
m the coals wih its 
as, caufe man 
offenfive _ but ay. when feparated, be applied to ufe- 
niacal quid which are aiheoca 
wand cole, if fuffered to remain 
he commenced his 
cis G 
d in the follo - 
roduced, and cet up in 
= ro ae furnace, by which it 
san be heated fo as to throw out the volatile portions of the 
c 
continue to burn with the moft fteady and regular 
introduced, 
ining oe or ie 
ties which may caufe an unpleafant {mell. 
ments, 
which the gas iffues in a ftream ; and if once li aed will 
get ima- 
air as long as the gas is fupplied. At other times a num- 
re) minute holes are made in the end of a pipe, 
ae form as aed jets de feu, and have a cat enor ap- 
oe ance. ‘This fometimes te placed in the focus of a pa- 
rabolic eae In cafes where the light is required to be 
thrown to a diftance, other burners are conftruéted upon the 
fame principle as the Argand lamp, forming a ae of 
e, andadmitting a current of air both to the inkde and 
1. of Plate XVII. Mi iecllangs’ is a fe€tion of an appara 
d by Mr. Samuel Clegg of 
ociety of Arts in 
1 are 
coals, to be decompofed by the-heat of a fires 7 
it. The retort is Jeg in a chamber 
are 
it has a flaunch and-a cover pede i a Yr, air 
tight, and faftened by a {crew in the centre, or by on 
fide; ais an iron pipe conduding from the retort 10 ‘a veflel 
G, fituated 
