290 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Couimercial Paraffine gave the followiug indices: 

 Per cent of solvent, 78.97. 



The results described above show a close agreement in the hydro- 

 carbons separated directly from petroleum, and the corresponding bodies 

 from paraffine, as well as the application of this method for obtaining the 

 molecular refraction of solid bodies. 



