DISEASES OF THE RESPIRATORY PASSAGES 181 



Tlie turkeys brought to the hx])oratory were kept in the 

 hnek yard of a eity residence. There were four in the flock 

 and one aft(M- tlie other liad ])ecoine affected. 



Fig. 68. Skiagraph of Head and Neck of Chicken. 

 A. trachea; B, esophagus: C, vertebra, D, crop filled with grains of 

 wheat; E, infraorbital or maxillary sinus; F, frontal sinus; G, feathers; 

 H, nostrils; I, eyes; J, musculature. 



From the standpoint of a field study it appears to be con- 

 tagious. 



The pox are noted on the unfeathered portions of the head 



