U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY—BULLETIN No. 98. 
L. O. HOWARD, Entomologist and Chief of Bureau. 
HISTORICAL NOTES ON THE CAUSES 
OF BEE DISEASES. 
BY 
Ee, PHILLIS, Pa 1. 
In Charge of Bee Culture, 
AND 
Gon WHITH, Pas Do MD: 
Expert in Bacteriology. 
IssuED Marcu 26, 1912. 




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WASHINGTON: 
GOVERNMENT PRINTING OFFICE, 
1912, 
