Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLIII. Xo. 4. — September, 190". 



THE PHYSIOLOGICAL BASIS OF ILLUMIXATION. 



By Lolhs Bell. 



Investigations os Light and Heat made or prBLisHED, wholly or di part, with AppEOPELiTioss 



FROM THE ROJIFORD FOvD. 



