Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLVII. No. 21. — March, 1912. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL 

 LABORATORY, HARVARD UNIVERSITY. 



ON ELECTRICAL PROPERTIES OF CRYSTALS. 



1. — STRATIFICATION AND CAPACITY OF CARBORUNDUM. 



Bt G. W. Pierce and Rhys D. Evans. 



With a Plate. 



