140 POULTRY 
disease. Either sweet or sour milk has been 
found to be satisfactory, but the poultry- 
man will find that it is easier to feed the milk 
sour. 
It is possible to eliminate this disease from 
a flock by the procedure known as the “agglu- 
tination method.” In following this plan a 
blood sample is taken from each hen, the 
hen being marked with a numbered leg band. 
This sample is sent to a bacteriological labo- 
ratory and put through a certain process 
which discloses whether or not that particular 
bird is infected with the disease. If she is 
infected, she is at once removed from the 
breeding pen. It has been found that after 
a flock has been thus tested for several 
generations, and possibly two or three retests 
have been made in any given year, the disease 
can be entirely eliminated. There are 
several of the state colleges which are doing 
this work at a nominal cost, usually ten cents 
for each bird tested. Once the disease has 
been eliminated it should never appear in the 
flock again unless it is brought in through 
some outside source. If a flock is found 
after two or three tests to be absolutely free 
