384 Miscellanies. 



of leathers, or stuffing box,) a communication was successively made, 

 by means of cocks, with a reservoir of the gas to be analyzed, a re- 

 servoir of oxygen, and with a receptacle of ammonia: an appeal was 

 made intermediately, in each case, to a mercurial glass syphon gauge, 

 in order to bring the density, at the time of admeasurement, to the at- 

 mospheric standard. The ignition of the gaseous mixture was effected 

 by means of the discharge of a calorimotor through a platina wire. 



These preliminary explanations being made, the process for analy- 

 zing the carburetted hydrogen furnished by the Gas Light Company, 

 was then performed by Dr. Hare's skillful and intelligent assistant, 

 Mr. J. Bishop. 



The following results were obtained, agreeably to several experi- 

 ments in which the condensation and absorption were the same. 



The oxygen employed having been first analyzed, by igniting it 

 with three volumes of hydrogen, was found to contain four per cent, 

 of impurity. 



The gas exploded with the oxygen imparted to it, one measure of 

 impurity for every 20 measures employed. 



Hence, 20 measures being assumed as representing one volume, in 

 order to have that quantity of pure gas, 21 measures were taken into 

 the eudiometrical receiver, and were mingled and ignited with seven- 

 ty-five measures of oxygen. 



A condensation of thirty-five measures was found to ensue — one 

 volume, or twenty measures, being attributable to the disappearance 

 of the gas. Since by its conversion into carbonic acid, oxygen under- 

 goes no change of volume, fifteen measures out of the thirty-five were 

 to be ascribed to the oxygen consumed by hydrogen. But fifteen 

 measures of oxygen require thirty of hydrogen, equal to a volume 

 and a half; and thus it appeared that this last mentioned quantity of 

 the last mentioned gas existed in the volume of gas subjected to 

 analysis. 



The residue, after being well washed with ammonia, was found to 

 have lost fifteen measures, which, containing, agreeably to the known 

 composition of carbonic acid, a like volume of carbon, represents the 

 quantity of this element in the gaseous volume subjected to examina- 

 tion. 



It follows, that there are three-fourths of a volume of carbon, and 

 one and a half of hydrogen, condensed into one volume of the gas ; so 

 that in four cubic feet, there are three cubic feet of vapor of carbon, 

 and six of hydrogen. 



The gas obtained by passing the vapor of alcohol through a porce- 

 lain tube, has been found, by Dr. Hare, to contain a volume of carbon 

 and a volume of hydrogen condensed into one volume. That obtained 



