LEHER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 



Washington, D. C, September 27, 1911. 

 Sir: I have the honor to transmit herewith a manuscript entitled 

 "Historical Notes on the Causes of Bee Diseases," prepared by Drs. 

 E. F. Pliillips and G. F. Wliite, of this bureau. The investigations 

 of the causes of bee diseases are highly important in the control of 

 these maladies. Many of the papers on this subject are not available 

 and many also record errors in observations and conclusions. The 

 purpose of the present paper is to assist bee keepers in obtaining a 

 proper understanding of the work done by the various investigators 

 whose papers are discussed. I respectfully recommend the publica- 

 tion of this manuscript as Bulletin No. 98 of this bureau. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



