1877.] 589 rSadtler. 



ethyl-hydride in the Burns Well gas and the 13.50 per cent, of hj^drogen 

 in the first sample of the Harvey Well gas. The gas from the Warren 

 Co. geological horizon — obtained at the Sheffield Well — is very similar to 

 the gas of the Burns Well in Butler Co. 



The gas from the McKean Co. geological horizon — obtained at the Wil- 

 cox Well — is distinctly different from any of those preceding it. The 29.29 

 per cent, of ethyl-hydride makes it a heavier gas. 



The three gases from the Lake Erie border however show the greatest 

 difierences. The per cent, of ethyl-hydride in these three analyses exceeds 

 the per cent of marsh-gas, so that it becomes reasonable to estimate some 

 of tliese heavy hydrocarbons as propyl-hydride. These three gases would 

 be the heaviest of all those examined. An experimental determination 

 of the specific gravity of the Erie gas made by the diffusion method gave 

 .804. The specific gravity as calculated from the analysis was .845. 



I will append several analyses of similar natural hydrocarbon gases that 

 have come to my hand. 



1. From a gas-well at West Bloomfield, N. Y. Analysed by Prof. Henry 

 Wurtz. (Silliman's Journal (2) XLIX p. 336.) 



2. From the Neff gas-well near Garabier, Knox Co. Ohio. Analysed by 

 Prof. E. W. Morley, Hudson, Ohio. (Private communication.) 



3. From a so-called "burning-spring" at St. Barthelemy, Isere, France. 

 Analysed by F. M. Raoult. (Wagner's Jahresbericht 1870, p. 704.) 



1. 2. .3. 



Carbonic acid 10.11 0.3 0.58 



Carbonous oxide 0.5 



Ethylene series 2.94 



Hydrogen 



Marsh-gas .' 82.41 81.4 98.81 



Ethyl-hydride 12.2 



Oxygen ■ 0.23 0.8 0.10 



Nitrogen 4.81 4.8 0.48 



100.00 100.00 99.97 

 In analyses No. 1 and No. 3, probably no attempt was made to distin- 

 guish between marsh-gas and Ethyl-hydride, and the figures given for 

 marsh-gas probably express the sum of the marsh-gas hydrocarbons. 



A description of the absorption tests by which I proved the presence of 

 ethyl -hydride and propyl hydride and an explanation of the formulas by 

 which the results of the gas-analyses were calculated appeared in my pre- 

 vious paper. (Vol. XVI, No. 97 of the Proceedings of the Am. Pliil. Soc. ; 

 also reprinted in American Cliemist for Sept. 1876). 



PROC. AMER. PHILOS. SOC. XVI. 99. 3v 



