Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXII. No. 7. — January, lbi)7. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY 

 OF THE CASE SCHOOL OF APPLIED SCIENCE, 



INVESTIGATIONS ON AMERICAN PETROLEUM. 

 By Charles F. Mabery. 



XXVni. — REFRACTIVE POWER OF THE HYDROCAR- 

 BONS AND CHLORINE DERIVATIVES DESCRIBED 

 IN THE PRECEDING PAPER. 



By Charles F. Mabery and Edward J. Hudson. 



AlB IN THE WORK DESCRIBED IN THIS PAPER WAS GIVEN BY THE ACADEMY FROM THE C. M. WaEREN 



Fund for Chemical Research. 



