43-4 



Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLIII. No. 4. — September, 1907. 



THE PHYSIOLOGICAL BASIS OF ILLUMINATION. 



By Louis Belt. 



Investigations on Light and Heat made or pirr.LisiiRn, wnoLLY or w part, with Appropriations 



FROM TUE KUMFOKD FUND. 



