Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVIII. No. 6. —October, 1902. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 

 CASE SCHOOL OF APPLIED SCIENCE. — XLIV. 



A METHOD FOR DETERMINING THE INDEX OF 

 REFRACTION OF SOLID HYDROCARBONS WITH 

 THE PULFRICH REFRACTOMETER. 



INDEX OF REFRACTION OF THE SOLID HYDROCARBONS 



IN PETROLEUM. 



By Charles F. Mabery and Lee Shepherd. 



Aid in thb Work described ix this Paper was given by rnE Academy from the 

 C. M. Warren Fo^D for Cuemical Researou. 



