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. Mabeky and Lee Shepherd. 



Aid in thb Work described in this Paper was given bt the Academy from the 

 C. M. Warren Fond for Chemical Research. 



