and Naphthaline, and on a new Acid produced. 403 
was used in the former experiment; and the washings and 
other operations being repeated exactly in the same way, the 
quantity of sulphate of baryta occasioned by the presence of 
sulphuric acid in the oxide, acids, &c. was determined. This 
deducted from the weight afforded in the first experiments, 
gave the quantity produced from the sulphuric acid actually 
existing in the salt. Experiments so conducted gave very 
uniform results. The mean of many indicated 8-9 grains of 
sulphate of baryta for 10 grains of salt used, or 89 grains per 
cent, equivalent to 30°17 of sulphuric acid for every 100 of 
salt decomposed. 
In the analytical experiments, relative to the quantity of 
carbon and hydrogen contained in the salt, a given weight of 
the substance being mixed with per-oxide of copper, was 
heated in a green glass tube. The apparatus used consisted 
of Mr. Cooper’s lamp furnace, with Dr. Prout’s mercurial 
trough; and all the precautions that could be taken, and 
which are now well known, were adopted for the purpose of 
obtaining accurate results. When operated upon in this way, 
the only substances evolved from the salt, were carbonic acid 
and water. As an instance of the results, 3°5 grains of the 
salt afforded 11°74 cubic inches of carbonic acid gas, and 0:9 
of a grain of water. The mean of several experiments gave 
32:93 cubic inches of carbonic acid gas, and 2°589 grains of 
water, for every 10 grains of salt decomposed. 
On these data, 100 grains of the salt would yield 329°3 
cubic inches of carbonic acid, or 153°46 grains, equivalent to 
41°9 grains of carbon, and 25°89 grains of water, equivalent 
to 2°877 grains of hydrogen. Hence 100 grains of the salt 
yielded argtas See PAT ONS St a16 
Sulphuric acid. . 30°17... . 85°35 
Carbon: Sekar ALSO. Sir ebissoe 
Hydrogen.... 2877 ... 813 
102°517 
In the second numerical column the experimental results are 
repeated, but increased, that baryta might be taken in the 
quantity representing one proportional, hydrogen being unity : 
and it will be seen that they do not differ far from the follow- 
ing theoretical statement. 
Baryta ..... 1 proportional .. 78 
Sulphuric acid . 2 dittoiwtgeis<i BO 
Carbon... .... 20 dittoxs..<{ #¢<. 120 
Hydrogen ... 8 Gites: . ». -8 . 
The quantity of sulphuric acid differs most importantly from 
the theoretical statement, and it probably is ‘hat element of 
3E2 the 
