THE AGRICULTURAL ASTECT OF TUBERCULOSIS. 
2 5 l 
nth swelling going down, not so tender to the touch. From 
this time the swelling gradually went down until it got the size 
of a tea saucer, and tenderness, gradually disappeared until 
October 25th when, the animal being killed for dissection, we 
dissected it out and found a number of small cavities filled with 
a thin yellowish-colored fluid, which, on microscopical examin¬ 
ation was found to contain pus cells. Cultures were made from 
the abscess thus formed, and same characteristic growth was 
obtained; also some cover glass preparations were made which 
showed, on examination with the microscope, the same bacillus 
as original. 
From the foregoing experiments the conclusions are that a 
great number of germs are present in a case of Poll-evil or fis¬ 
tula which has been opened and exposed to the air; a number 
also in abscesses which never have been opened, the parts 
having become infected from within by pus germs having suffi¬ 
cient virulence to cause an abscess. 
RefereJice. —W. Williams, Surgery; Liautard, Surgery; N. 
Senn, Surgical Bacteriology; Sternberg, Surgical Bacteriology; 
Crookshank, Surgical Bacteriology. 
The work of this thesis was done under the immediate 
supervision of Dr. W. N. Niles, Assistant Professor of Veterinary 
Medical Science, in his laboratory at the Iowa Agricultural 
College, Ames, Iowa. 
I wish to thank Dr. George J. Howell and Dr. A. B. Morse 
of Des Moines, Iowa, for their kind assistance in helping me to 
material for the study of this subject. 
THE AGRICULTURAL ASPECT OF TUBERCULOSIS. 
By Sessions, Sec’y State Board Agriculture. 
A paper read before the Massachusetts State Veterinary Medical Association. 
It is but a few years since tuberculosis in cattle was known 
to the public to be prevalent. The attention of scientists, par¬ 
ticularly of veterinarians, has lately been directed to the disease 
as a source of danger to the life and health of the human fam- 
