Proceedings of the American Academy of Arts and Sciences. 



Vol. XLIV. No. 12. — March, 1909. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL 

 LABORATORY, HARVARD UNIVERSITY. 



CRYSTAL RECTIFIERS FOR ELECTRIC CURRENTS 

 AND ELECTRIC OSCILLATIONS 



II.— CARBORUNDUM, MOLYBDENITE, ANATASE, BROOKITE. 



By George W. Pierce. 



With a Plate. 



Investigations on Lioht and Heat made and published, wholly ok in paet, with Appropriation 



from the rumford fund. 



