Adeney — An Apparatus for Gas Analysis, 8fc. 553 



After absorption with potassium hydrate : — 



Total pressure, . . . . 

 Tension of C0 2 , ..... 



After absorption with pyrogallic acid : — 

 Total pressure, ..... 

 Tension of oxygen, .... 

 Temperature, ..... 

 Tension of nitrogen, .... 



Tension of aqueous vapour at 16*5 = 13-964 mms. 

 ,, ,, at 18-4 = 15-389 mms. 



When explosions are to be made in the apparatus, the gas is 

 first measured as above described ; the oxygen or hydrogen is 

 then passed into the laboratory vessel through the re-agent tube, 

 and after the mixed gases have been measured, they are returned 

 to the laboratory vessel and exploded therein under reduced pressure 

 according to the directions given by Thomas (Chem. Soc. Journ., 

 35,213). 



The hydrogen or oxygen may be passed into the laboratory 

 vessel with great facility. The gas is first collected in a test tube 

 or other suitable vessel over mercury ; the indiarubber tube attached 

 to the re-agent tube is then carefully freed from air and filled 

 with mercury in the manner above described, and cautiously in- 

 serted into the test tube ; then, on lowering the reservoir, the gas 

 will pass from the test tube into the laboratory vessel. The method 

 of employing the apparatus for the analyses of nitrates or carbonates, 

 and for other similar purposes, will be understood from the fore- 

 going descriptions. It need only be mentioned that a known 

 quantity of the substance to be analyzed is placed in a small flask 

 in the solid form or in solution, and the flask is attached to the 



