healthy birds, insanitary conditions and decomposed feed, especially meat.
It seems that under certain conditions, such as insanitary quarters and
birds that are low in constitutional vigor and weakened from other causes,
certain germs may become disease-producers. The death rate from mixed
infections is very heavy in poultry.

_The symptoms_ vary in the different cases. The disease may be highly
acute, as in limber neck, or chronic, extending over a period of a week or
more. Diarrhoea is not a prominent symptom in the majority of cases.

The post-mortem lesions vary from a hemorrhagic to a chronic inflammation
of the different body organs and serous membranes.

_The treatment_ is preventive. A frequent cleaning and disinfecting of the
poultry house and surroundings, avoiding the feeding of spoiled feed, or
allowing the drinking fountains and feeding places to become filthy, are
effective preventive measures. Sick birds should be either isolated and
quarantined, or destroyed. Antiseptics may be given with the feed and
drinking water.

AVIAN DIPHTHERIA (ROUP).--This infectious disease of poultry is especially
common in chickens. It is characterized by a catarrhal and diphtheritic
inflammation of the mucous membranes of the head.

_The specific cause of roup_ has not been determined. The disease-producing
germs are present in the discharges from the nostrils, eyes and mouth, and
the body excretions of sick birds. Birds having a mild form of roup, or
that have recently recovered from it, are common carriers of the disease.
The disease is usually introduced into the flock by allowing birds exposed
at poultry shows, or recently purchased breeding stock from an infected