TO DANIEL ELMER SALMON 
LARGELY THROUGH WHOSE LABORS THERE WAS 
ESTABLISHED IN THE UNITED STATES DEPARTMENT 
OF AGRICULTURE THE BUREAU OF ANIMAL INDUSTRY 
WHICH HAS MADE POSSIBLE EXTENSIVE INVESTIGA- 
TIONS INTO THE NATURE OF EPIZOOTIC DISEASES IN 
AMERICA AND WHO FOR TWENTY-ONE YEARS DIRECTED 
THESE INVESTIGATIONS 
THIS VOLUME IS DEDICATED. 
