Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 2. —July, 1903. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD COLLEGE. 



ON THE PROLONGATION OF SPECTRAL LINES. 



By Theodore Lyman. 





NE 



With a Plate. 



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



prom the Kumford Fund. 



