Philosophical Transactions. $89 
plate, describes the apparatus and materials which he em- 
ployed, and the various steps of his mode of operating ; he next 
gives in detail an example of the mode of computing the 
relation of the constituents from the experimental results, 
which together with his “ Table of Organic Analysis,” we shall 
transcribe for the information of our readers. 
1.4 grains of sulphuric ether, specific gravity 0.70, being slowly passed 
in vapour from the glass bulb through 200 grs. of ignited peroxide of cop- 
per, yielded 6.8 cubic inches of carbonic acid gas at 66° F., which are 
equivalent to 6.57128 of dry gas at 60°. This number being multiplied by 
0.127= the carbon in] cubic inch of the gas, the product 0,8345256, is the 
carbon in 1.4 grains of ether ; and 0.8345256 yx § = 2.2254 = the oxygen 
equivalent to the carbonic acid. The tube was found to have lost/4.78 grs. in 
weight, 0.1 of which was due to the hygrometric moisture in the oxide, and 
1.4 to the ether. The remainder, 3.28 is the quantity of oxygen abstracted 
from the oxide by the combustible elements of the ether. But of these 3.28 
grs., 2.2254 went to the formation of the carbonic acid, leaving 1.0546 of 
oxygen, equivalent to 0.1318 of hydrogen. Hence, 1.4 ether, by this expe- 
riment, which is taken as the most satisfactory of a great number, seem to 
consist of 
Carbon . . 6 ‘ ¢ - 0.8345 
Hydrogen 6 . 5 F 2 a 0.1318 
Water. eis . c : 0.4337 
» 1.4000 
And in 1 grain we shall have 
Carbon : 0.5960 ‘ 3 atoms . 2.25 4 60.00 
Hydrogen . 0.1330 - 4datoms . 050 . 13.33 
Oxygen . 0.2710 . latom a PLLOOF in (Shi 
1.0000 3.75 100.0 
Or, 3 volumes olefiant gas = 3 X 0.9722 = 2.9166 
2 . vapour of water . 2X 0.625 = 1.25 
4.1666 
which suffering a condensation, equal to} the whole vapour of water, will 
give an ethereous vapour, whose specific gravity is 2.5. 
The proportion of the constituents of sulphuric ether, deduced by M. 
Gay-Lussac from the experiments of M. Th. de Saussure, are 2 volumes 
olefiant gas + 1 volume vapour of water, which 3 volumes are condensed 
into 1 ofvapour of ether, having a specific gravity = 2.58. The ether which 
L used had been first distilled off dry carbonate of potash, and then di- 
gested on dry muriate of lime, from which it was simply decanted, accord- 
ing to the injunction of M. de Saussure. Whether my ether contained 
more aqueous matter than that employed by the Genevese philosopher, or 
whether the difference of result is to be ascribed to the difference in the 
mode of analysis, must be decided by future researches. 
By analogous modes of reduction, the following results were deduced 
from my experiments. I ought here to state, that in many cases the mate- 
rials, after being ignited in the tube, and then cooled, were again triturated 
in the mortar, and subjected to a second ignition. Thus none of the carbon 
could escape conversion into carbonic acid. I was seldom content with 
one experiment on a body, frequently six or eight were made. 
