4 MCDOUGALL AND HoWLES, Xiiric Acid from Air. 

 Readings of the Pozccr Consuini'd in Producimr the Flame. 



Duration of experiment, 9 hours 30 minutes. 

 Average watts used in flame, 172. 

 VieUi of nitric acid, 35 grms. 



The hii;h-tonsion current was letl ton pair of platiiunii- 

 iridium electrodes situated in a stoneware vessel, which 

 will be called the " combustion chamber." Air was con- 

 tinuously drawn into this vessel, and, when the flame was 

 burning, a portion of the nitroi;"en became oxidised. The 

 oxides thus produced were drawn throuL;h a condensing 

 apparatus, consisting of a series of W'oulff's bottles con- 



