176 Dr. Hare on the Constnictmi and Applications of the 



the combustion of the carbonic oxide with the oxygen gas, - 

 may be absorbed. Of course, if the gases be pure, the absorp- 

 tion will be complete. It might perhaps be found preferable 

 to introduce lime-water by means of the syphon and bag, 

 fig. 4. 



Accordance of the Analysis of Olefiant Gas isoith the Theory of 

 Volumes^ illustrated hy the Volumescope. 



As a volume of olefiant gas consists of two volumes of hy- 

 drogen and two volumes of carbon vapour, if it be exploded 

 with an excess of oxygen, say four volumes, all the hydrogen, 

 and one volume of oxygen, will be converted into water. Mean- 

 while two volumes of oxygen, uniting with two of carbon va- 

 pour, will constitute two volumes of carbonic acid. These 

 may be absorbed by lime-water introduced as in the case of 

 carbonic oxide. It follows that one volume of oxygen will 

 remain. 



Analysis of a Mixture of Carbonic Oxide, with one or more of 

 the Gaseous Compounds of Carbon and Hydrogen. 



If olefiant gas be present, it may be condensed by mingling 

 in any tall narrow vessel protected from light over water, 100 

 measures of the mixture, with 200 measures of chlorine ; and 

 at the end of about a quarter of an hour, agitating the residue 

 with a caustic alkaline solution, to remove any excess of the last- 

 mentioned gas*. The measurement may be easily performed 

 by means of the sliding-rod eudiometer (described in the Phil. 

 Mag. vol. Ixvii. p. 29), the residue being transferred into, and 

 measured from the receiver, (fig. 2, same page,) agreeably to 

 the instructions given in the case of nitric oxide, article l^S. 



The bihydroguret of carbon, usually called carburetted hy- 

 drogen f, consists of two volumes of hydrogen and one of car- 

 bon condensed into one volume. This gas not being conden- 

 sible by chlorine, when light is excluded, a mixture of it with 

 carbonic oxide should be analysed by the following process. 

 Being mixed with three times its bulk of oxygen gas within the 

 bell-glass ON, communicating with the receiver of the sliding- 

 rod eudiometer (fig. 1. page 115 of last Number), an adequate 

 quantity may be exploded, pursuant to the directions in the 

 case of carbonic oxide and olefiant gas. 



More than half a cubic inch of the gaseous mixture, with 

 the necessary addition of oxygen, cannot be safely exploded 

 at once in any ordinary eudiometer : but by successive opera- 

 tions a large quantity may be exploded, and inferences may 

 be founded upon the accumulated result. 



* See Traite de C/nrnic, par Thenard, vol. v. page 34. 

 t It is sometimes called light carburetted hydrogen. 



Let 



