HYDROGEN OAS. 511 



often opened, and portions of it used during the 

 interval. The bottle was now half- full of water. 

 The purity of this gas was tried just at the time of 

 making the following experiments, by .exposing it 

 to hydroguretted suiphuret of lime in the usual 

 way. The nitrous gas employed contained, by the 

 test of sulphate of iron, 11.5 per cent, of azote. 

 The inflammable gas had been freed from carbo- 

 nic acid, but it contained 1$.^ per cent, of com- 

 mon air. 





Measures of 

 inflammable 

 gas. 



Measures of 

 oxygen. 



Bulk of re- 

 sidue. 



Bulk of do. 

 when wash- 

 ed in lime- 

 water. 



Measures of 

 nitrous i;as 

 added to do. 



Bulk of re- 

 sidue. 



Bulk of do. 



washed in 

 sulphate of 

 iron. 



1 





5° 



3 1 



9 



22 



24 



9 1 



2 



2 5 



60 



40 



J 7 



40 



3° 



12 



3 

 4 



20 



55 



Does not burn. 







25 



55 



44 



■ 38 



88 



42 



18 



_ „ _ 



5 



25 



50 





S-5 



39 



3 2 



10 



6 

 7 



40 



35 



1 



D 



oes not b 



urn. 







40 



40 



Burns. 







From this table, and our knowledge of the con- 

 stituents of the gases used, it is easy to deduce the 

 following : 



V 



