59.11.856:67.99 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 



MUSEUM OF COMPARATIVE ZOOLOGY AT 



HARVARD COLLEGE. 



No. 321. 



THE RELATION OF PHOTOTROPISM TO SWARMING IN 

 THE HONEY-BEE, APIS MELLIFERA L. 



By Dwioht E. Minnich. 



Fkoh the Journai. op Psychobiologt, Vol. II, No. 2. 



CAMBRIDGE, MASS., U. S. A. 

 April, 1920. 



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