Account of a new Eudiometer. 123 



tion, while the carbonic acid gas will be a little rarefied, but 

 no absorption of it will take place. ' 



Previous to these experiments on the compound gases, I 

 had tried several on the carbonic acid, sulphurated hydrogen, 

 and nitrous gases in their unniixcd stales. 100 parts of pure 

 alcohol at the common temperature will absorb 70 parts in 

 Tolume of carbonic acid, and the same quantity of sulphu- 

 rated hydrogen. Alcohol impregnated with the latter, pre- 

 cipitates the solutions of the nitrates of lead, silver, and mer- 

 cury, of a dark brown colour. Nitric acid of the specific 

 gravity 1*4, and also of 1'23, absorbs carbonic* acid gas, 

 without any apparent change in the nitric acid. Sulphu- 

 rated hydrogen gas is also absorbed by nitric acid, which 

 occasions a slight milky cloud or precipitate therein. 



The solutions of nitrates of barytes, strontian, and lime, 

 absorb carbonic acid gas equal to half their volume, without 

 any apparent alteration. 



Solutions of nitrates of barytes, strontian, and lime, also 

 absorb sulphurated hydrogen gas, equal to six-tenths of their 

 volume, with a slight chang;e of colour ; the solutions thui* 

 impregnated precipitate solutions of nitrates of mercury and 

 of silver, and acetite of lead of a dark brown colour, and- 

 wGuId be useful as chemical re-agents. 



Carbonic acid gas, as I have before stated, decomposes- 

 solutions of the acetite of lead, hot or cold, forming a pre- 

 cipitate of carbonate of lead. 



Carbonic acid gas is absorbed by the solution of the green 

 sulphate of iron under the temperature of 100" Fahrenheit j 

 but this is only the action of the water of solution. If the 

 temperature be' near boiling, or above ISO" Fahrenheit, the 

 solution increases the volume of the cas without the slijrhtest 

 absorption : after carbonic acid gas has itt tliif.; way been 

 treated with the hot solution^;, it is still solwble in water at 

 the common temperature, or in aqueous solutions of lime 

 or alkali. 



Nitrous gas is absorbed by solution of sulphuret of pot- 

 ash, with a separation or formation of sulphur. Upon in- 

 jecting the eolation the sides of the measure take a milky 



appearruicc. 



