699 



time of sealing before the blowpipe, and that at the time of opening 

 under mercury. 



The following are the particulars of an examination of the gas 

 contained in the flask after the four hours' digestion at 100 C. 



In order to remove any alcohol vapour, the gas was agitated with 

 about one-fifth of its volume of boiled distilled water, when it under- 

 went very little diminution in volume a circumstance, which shows 

 that no volatile liquid capable of absorption by water had been gene- 

 rated during the reaction. 



Some of the washed gas was then treated with a potash bullet and 

 with pyrogallic acid, in order to remove any traces of carbonic acid 

 and oxygen. The amount of these gases present was very trifling, as 

 the readings show : 



Volume of gas taken (corrected (dry) at C. and 



1000 millims'. pressure) 65-091 



Volume of gas after potash and pyrogallic acid 

 (corrected (dry) at C. and 1000 millims'. 

 pressure) 64*734 



After this treatment a portion of the gas was transferred to the 

 eudiometer, in which it furnished the following readings : 



From which is deduced : 



Gas taken 29*500 



Nitrogen 1*072 



In per-centage. 



Gas free from nitrogen 28'428 100*00 



Carbonic acid 28-196 99*18 



Contraction 14*720 51*78 



Oxygen consumed 14*488 50*96 



