Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 3. — July, 1903. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD COLLEGE. 



AN EXPLANATION OF THE FALSE SPECTRA FROM 

 DIFFR A OTION GRA TINGS. 



By Theodore Lyman. 



With a Plate. 



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



FROM THE RUMFORD FUND. 



