MABERY. — SULPHUR PETROLEUMS. 47 



to the drill than the other, which is finer grained and for the most 

 part loose and granular like sand. For convenience these specimens 

 may be designated as I. and II. consecutively, and their composition 

 is shown by the following results of analysis, to which is appended for 

 comparison the composition of the Trenton limestone at Findlay, III., 

 at a depth of 1,096 feet, and of the same oil rock at Lima, IV., at a 

 depth of 1,247 feet.* 



It therefore appears that the dolomitic condition is not wanting in 

 the oil-bearing Corniferous limestone ; in fact, magnesic carbonate 

 seems to be somewhat in excess of the quantity present in the Ohio 

 Trenton limestone. The specimens were impregnated with oil and 

 were thoroughly washed with gasoline to remove so far as possible 

 the carbonaceous portion. 



In a distillation of Petrol ia oil under atmospheric pressure, the first 

 distillate appeared at 115°, and the following weights in grams were 

 obtained from 800 grams : — 



• 115^-150^ 1503-200'^ 200°-250° 250°-300° 300°-350° Residue. Loss. 



In the proportions that distil at different temperatures and in the 

 specific gravity of the distillates, the Oil Springs resembles more 

 nearly the Findlay oil : — 



— 100° 100'-150= 150^-200° 200^-250^ 250^-500° 300^-350=' Residue. Loss. 



Weights 8 41 90 62 88 47 357 7 



Percent 1.14 5.86 12.85 8.86 12.6 6.71 51.0 0.98 

 Sp. Gr. 0.7335 0.7675 0.7984 0.8222 0.8386 0.9032 



A comparison of the distillates at increasing temperatures from oils 

 of different localities has been included in considering the proper- 

 ties of the Ohio oils. A clearer idea of the peculiar character of 

 Canadian oil may be gained by comparing the distillates from it with 



* Orton, Geological Survey of Ohio, 1890, p. 13. 



