Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLI. No. 30. — May, 1906. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 

 HARVARD UNIVERSITY. 



DISPERSION IN ELECTRIC DOUBLE REFRACTION 



By Howard Lane Blackwell. 



With a Plate. 



Investigations on Light and Heat made or published, wholly or in part, with Appropriations 

 from the rumford fund. 



