Prepared under the direction of 



Charles H. Winslow, 



Chief of the Division of Research, Federal Board for Vocational Education. 



By 



Walter J. Quick, M. S., Ph. D., 

 Special Agent Agricultural Research. 



ACKNOWLEDGMENTS. 



Acknowledgment is due Dr. E. F. Phillips, Apiculturist of the Bureau of Ento- 

 mology, United States Department of Agriculture; to F. C. Pellett and C. P. Dadant, 

 editors of the American Bee Journal, Hamilton, 111., and A. I. Root Co., Medina, Ohio, 

 for suggestions, data, and illustrations; also to Dr. John Cummings, of the Research 

 Division, for editorial assistance. 



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