70 DISEASES OF DOMESTICATED BIRDS 
(Bulletin 68, Storrs Agricultural Experiment Station) 
Fic. 4. Cycle of infection in white diarrhea. 
relation to age. During the first forty-eight hours the baby chick 
‘is most susceptible to Bactertwm pullorum and at this period of life, 
has practically no resistant forces to combat the infection. In the 
succeeding twenty-four hours, more resistance is shown by those not 
