71 
Fowl Typhoid and Fowl Cholera 
breaks indicate that the disease has been efficiently checked, although it is 
premature to make any general assertion as to the possibilities of recurrence 
through the medium of soil pollution or carriers. 
The phenomena of cross-agglutination between members of the colon- 
typhoid intermediates has presented an interesting phase to this specific 
group of organisms. The data regarding cross-agglutination as worked out 
m this laboratory is presented in Table II, in the study of the causative 
organism. The findings is in agreement with other investigators of this 
phenomena. 
FIG. 30.—THE EFFECTS OF VACCINATION ON EGG PRODUCTION 
