PREFACE ' 
Poultry farming as a means of profit can 
be made successful only by maintaining the 
most vigorous and sustained campaign 
against disease. The aim of the poultry 
rearer should be to stamp out disease by 
preventive measures. Practical experience 
proves the inefficiency of many so-called 
cures, and points to the urgency of poultry- 
men endeavoring to understand more thor- 
oughly the causes of the ailments to which 
domestic fowls are liable. 
My aim is to put a concise handbook into 
the hands of poultry rearers, who should 
thus be assisted in determining the various 
diseases and in taking the precautionary 
steps important in preventing the introduc- 
tion and spread of contagious diseases. No 
effort is made to elaborate the scientific side 
of the subject. Those desirous of obtain- 
ing full information about the types of 
organisms that have been proved to be the 
specific causes of, or to be invariably asso- 
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