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 

 DIFFRACTION GRATINGS. 



By Theodore Lyman. 



Wttii a Plate. 



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



from the rl/mforp fund. 



