CADY AND MCFARLAND.| Composition of Natural Gas. 241 
stone at Baldwinsville, N. Y., by Dr. Durand Woodman." 
This analysis is as follows: 
TABLE No. 6. BALDWINSVILLH, N. Y. 
NCO ti eT Chee bemict hits orniere lee. oi cdele olentenolalls) acaieve 's tenes 0.00 
Hydrogen (by palladium method)............. trace. 
IMIG AERIS): ald Brat ARMOR cid Or Gi CIRO CERO IRC RCE Rea Rea aeae 98.40 
CATGHOMMINONO RAC waters. ia wobec keronekel eiollsvoheraGenssane 0.95 
CAE OMMGI OR Cetera stew a eps crsticcctateus tele hecckolers sree lates 0.00 
HNN TINDIT ATG Sires en ec cco stette «ote ok eee oi cueseeietene etapa ous 0.25 
Oey OTe ated e aeleols (ares obs evsvele are arate aretoreisl ove) aisle trace. 
INGtrEo tenia dbya dither ence) iy. si-te-telorscie ere crete 0.40 
100.00 
Specific gravity, 0.551, determined by W. W. Randolph. 
Specific gravity—calculated, 0.558. 
Heat units per cubic foot, 1013.5. 
Orton (loc. cit.) considers that these figures may be taken 
with all confidence as representing the composition of the Tren- 
ton limestone gas of New York. This assumption is made in 
the face of the fact that the gas is held to be a shale gas, be- 
eause it shows the following characteristics (loc. cit., p. 469) : 
“1. No two wells draw their supply from exactly the same 
horizon. 
eNO two wells have the same rock pressure, ‘ 
difference of several hundred pounds can sometimes be ae 
between closely contiguous wells. 
“3. Salt-water is not found in any considerable quantities 
in any of the wells, and is entirely absent from most records 
even of wells that are drilled to the granite. 
“4. No portion of the series from which the gas is derived 
shows porosity.” 
These facts are given by Orton, particularly characteristics 
1, 2 and 4, as showing plainly that the wells have isolated 
sources, and they are so interpreted by him. Under these cir- 
cumstances the assumption that an analysis from one of these 
wells represents them all is not in accord with the varied re- 
sults in the Kansas field, where conditions are somewhat sim- 
ilar. (See p. 240.) Additional evidence that gases from the 
same locality may vary in composition even when coming from 
apparently the same source is given by Phillips’s!*° results on 
the gases from six wells near Tarentum, Pa. These wells were 
situated nearly on a line, less than a mile long. The samples 
were all taken within an interval of three hours, and yet 
showed marked variation. 
124. Edward Orton, Bull. cf N. Y. Mus., vol. 6, No. 30, 1899, p. 467. 
125. Am. Chem. Jour. 16, p. 412 (1894). 
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