59.11.856:51.23 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 



MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 



COLLEGE. E. L. MARK, Director. 



No. 193. 



THE REACTIONS OF PLANARIANS TO LIGHT. 



By Herbert Eugene Walter. 



From the Journal of Experimental Zoology, Vol. V., Nos. 1, 2. 



CAMBRIDGE, MASS., U.S.A. 

 December, 1907. 



