Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLIII. Xo. 4. — September, 1907. 



THE PHYSIOLOGICAL BASIS OF ILLUJIIXATION. 



LIBRARY 



By Louis Bell. NEW YORK 



BOTANIC 

 OAKDEN. 



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



from the rumford fcnd. 



