ON CARBiniETTED HIDROGEN GAS. 325 



ble diminution of bulk. Its cqmbustibiUty by this process { 



is confined within very narrow limits. It does not burn, 

 unless the bulk of the oxigen rather exceeds its own bulk, 

 and it ceases to burn, when the oxigen gas is more than 2^ 

 times the bulk of the inflammable gas. The limits of com- 

 bustion, according to my trials, are 100 measures of in* 

 flammable gas, and 103 or 227 measures of oxigen gas. 

 A mixture of 100 measures of inflammable gas with 282 or 

 292 measures of oxigen gas does not burn. 



8. A good many experiments on the combustion of this 

 gas with oxigen by electricity, give the following general 

 result: 100 measures of the inflammable gas consume 205 

 measures of oxigen gas, and 104 measures of carbonic acid 

 gas are formed. This result very nearly agrees with the 

 experiments of M;*. Dalton, who found,, as I have been 

 informed by Dr. Henry, that 100 measures of this g^s re- 

 quire for combustion 200 measures of oxigen gas, and form 

 100 measures of carbonic acid. The following table con- Exptriments 

 tains a few of the experiments which I made upon thjs gas, "^*^® °" ***^ 

 The others were precisely of the same kind, and coincided 

 with these as nearly as possible. 



The oxigen gas used contained 12 per cent of azote. It 

 had been prepared from hyperoximuriat© of potash, and, 

 when recent, contained only 1 per cent of azote. It had 

 been kept above a year in a crystal bottle well stopped; 

 but had been 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 sul- 

 phuret of lime in the usual way. The nitrous gas employ- 

 ed contained, by the test of sulphate of iron, 11*5 per 

 cent of azote. The inflammable gas had been freed from 

 carbonic acid, but it contained 13*3 per cent af commo^ 

 ftir, 



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