TO DANIEL ELMER SALMON 



LARGELY THROUGH WHOSE LABORS THERE WAS ES- 

 TABLLSHED IN THE UXITED STATES DEPARTMENT OF 

 AGRICULTURE THE BUREAU OF ANIMAL INDUSTRV 

 WHICH HAS JLADE POSSIBLE EXTENSIVE INVESTIGA- 

 TIONS INTO THE NATURE OF EPIZOOTIC DISEASES IN 

 AMERICA AND WHO FOR EIGHTICEN YEARS HAS DI- 

 RECTED THF;sE INVESTIGATIONS 



THLS VOLUME IS DEDICATED. 



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