Table III. Distribution of Infection among Various Breeds. 



Table IV. Classification of the Sizes of Flocks tested. 



Table V. Number of Flocks having Certain Limits of Infection. 



Degree of Infection. 



No infection 

 1- 5 per cent 

 6-10 per cent 

 11-15 per cent 

 16-20 per cent 

 21-25 per cent 



Number of 

 Flocks. 



Degree of Infection. 



26-30 per cent 

 31-35 per cent 

 36-40 per cent 

 41-50 per cent 

 51-60 per cent 

 More than 60 per cent 



Number of 

 Flocks. 



