Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLII. No. 16. — Jaxuary, 1907. 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY (JF THE 

 MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE, 

 E. L. MARK, DIRECTOR. — No. 183. 



AN EXPERIMEXTAL STUDY OF THE IMAGE- 

 FORMING POWERS OF VARIOUS 

 TYPES OF EYES. 



By Leox J. Cole. 



