INTRODUCTION ix 
the parasitisms, have been elucidated sufficiently to enable veterin- 
arians or poultry owners to prevent them. Others that cause heavy 
losses, such as roup or diplitheria and tuberculosis, can be controlled. 
When this is done, millions of dollars worth of poultry that is now 
lost will be saved. This can be done as soon as the technical knowl- 
edge, now available, is utilized to its full extent. 
It is believed that veterinarians can render a valuable service to 
this heretofore professionally neglected, yet important industry, es- 
pecially in localities conspicuous for the raising of poultry. Be- 
cause of the relatively small value of the individual, and the large 
numbers to be dealt with, methods for preventing disease must be 
applied to the flock. With the exception of the more valuable 
birds, individual treatment may not be practicable, but the princi- 
ples of sanitation and the preventive measures are as helpful here 
as elsewhere in the raising of animals. Veterinarians should re- 
alize that the treatment, prevention or control of diseases in poultry, 
as well as in quadrupeds, is primarily an economic question and that 
a score of dollars saved by preventing or treating diseases in fowls 
is just as essential as the saving of a like amount in sheep or calves. 
This book, dealing with. the diseases and the parasites of poultry, 
will be of much aid to veterinarians who wish to render full service 
to their communities. 
V. A. Moors. 
