14 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Specific Gravity. 



Ohio (MarkowiiikofF and Ogloblin) 0.887 



Baku (Apscheron) " " " 0.855-0.885 



Galicia " « " 0.835-0.895 



American Petroleum (Petrolitz) 0.830 



(Weil) 0.827 



Canada (Markownikoff and Ogloblin) 0.828 



" " "■ " 0.844 



Alsace (Pechelbronn) « " " 0,668 



The value 0.887 assigned by Markownikoff to Ohio oil is much 

 higher than has elsewhere been given. It must have been obtained 

 in an oil from another Ohio field, perhaps from the Mecca district. 

 The values given by Markownikoff for Canada oil must refer to a 

 product from the Oil Springs district, although the number 0.828 is 

 lower than is usually found even in that oil. The numbers given by 

 Redwood are 0.844-0.854 for Oil Springs oil, and 0.859-0.877 for 

 Petrolia oil. In Oil Springs oil we found 0.8427-0.8389 (gas oil), 

 0.8442, and in Petrolia oil, 0.8553, 0.8621, 0.8800. 



In ascertaining the quantity of sulphur by combustion in air in the 

 crude oil from which distillates were prepared for examination, the 

 following results were obtained: (1) 0.73 per cent, (2) 0.72 per cent, 

 (3) 0.72 per cent. In oils previously examined the percentage of sul- 

 phur has not been above 0.60 per cent. Sulphur was also determined 

 in the oils collected in the Findlay and Lima districts in the order of 

 the numbers given above: — 



In Apscheron oil, Markownikoff and Ogloblin* obtained 0.064 per 

 cent, and 0.16 per cent in Trans-Caspian oil. 



The percentages of carbon and hydrogen in the oil from which dis- 

 tillates were obtained were found by combustion in air with a layer 

 of plumbic peroxide in front to retain the sulphur f: carbon, 84.57; 

 hydrogen, 13.62. In other samples from Findlay and Lima carbon 

 and hydrogen were also determined : — 



* Ann. Cliem. Phys., [6.], II. 393. t Warren, These Proceedings, VI. 472. 



