568 



IOWA DEPARTMENT OF AGRICULTURE 



No. 2. — The cow shown in the above picture is apparently healthy. She does 

 not cough, her appetite is good, she gives a large quantity of milk 

 and is in excellent general condition for a dairy cow. At the time 

 her picture was taken it was known that she had been affected 

 with tuberculosis at least four years and that she had been passing 

 tuberculosis germs from her body at least three years. 

 The mixed dung of this cow and of the cow shown in the next picture 

 caused tuberculosis in hogs that were permitted to eat it. 



