vii THE BURNING OF INFLAMMABLE AIR 121 



quantity of the liquid product. The method of procedure 

 was to admit T * Y volume of oxygen, fill up with hydrogen, 

 and explode; by admitting fresh quantities of oxygen to 

 the excess of hydrogen six further explosions could be 

 made. A fresh supply of hydrogen was then admitted 

 and the process repeated until 137 explosions had taken 

 place; the globe was then found to be filled with a 

 residue of non-explosive gas, which was drawn out by means 

 of a pump, collected and measured. At the end of three 

 series of experiments, in which 372 explosions were made, 

 the quantities of gas used were : 



Hydrogen ... ... 145 T Vi pints. 



Oxygen *.-.?' ./ 74 A 



The weight of gas, calculated from the measured densities, 

 was : 



Hydrogen ... ... ... ... 442*03 grains. 



Oxygen 1786*53 



2228-56 ,, 

 Or corrected for changes of pressure 2187-56 ,, 



The products were : 



Liquid ... ' ... 1917-10 grains. 



Unburnt gas (7 pints) ... ... 171*91 



2089*01 

 Deficiency ... ... ... 98*55 grains. 



" This liquid, perfectly transparent, reddened impercep- 

 tibly paper tinted blue by tournesol, much less than that 

 obtained in a previous experiment, less even than saliva. 

 This acidity can not be attributed to fixed air, because the 

 liquid did not precipitate lime-water, and because distilled 

 water, equally acidulated by fixed air, at once rendered lime- 

 water milky ; it scarcely whitened a solution of silver in 

 nitric acid, and a little more sensibly that of mercury in 

 the same acid. In addition to its slight acidity, it has also 

 the empyreumatic taste that water always acquires in distilla- 



