182 POULTRY DISEASES 



and neck. There is at first noted a small pimple-like eleva- 

 tion, Avhicli gradually becomes larger and in the course of 

 a few days may appear four or even five millimeters in diam- 

 eter and tAvo or three millimeters in elevation. They do 

 not appear as is the case in chickenpox ; that is, they have 

 no rounded l)leb-like appearance, but have almost perpendicu- 

 lar walls, with flat tops, and are shaijed like an opera hat. 



In the course of a few days, in many cases without any 

 treatment, the diseased area becomes dry and the side walls 

 may be picked off, leaving a whitish, scar-like spot. The 

 disease usually does not appear very virulent and little or no 

 treatment is required. In some cases where we have advised 

 the use of a five per cent carbolized vaselin, excellent results 

 have been reported. Again, where we have had cases under 

 our observation, they recovered without treatment. How- 

 ever, there can be little doubt but that at times the attacks 

 are rather severe and may even cause death. While this has 

 been reported to us upon good, reliable sources, yet we have 

 not personally made such, observations. The cases studied 

 in the laboratory did not appear to suffer constitutionally, 

 as there was no loss of appetite and the birds were in good 

 flesh. 



Onl}^ one test was made to determine if the disease could 

 be transmitted. The curetted material from a fresh nodule 

 was rubbed in a scarified area of the comb of a three-year-old 

 White Orpington cock. The results of this one test were 

 negative. No opportunity was afforded to conduct experi- 

 ments upon birds not exposed to the disease, though such 

 procedure is contemplated. 



CONTAGIOUS INFLAMMATION OF THE AIR SACS IN 



GEESE 



This is an infectious disease caused by a slender bacillus. 



The symptoms are those of weakness, staggery gait, great depres- 

 sion, difficultly in rising, kicking at the head, accelerated respira- 

 tion, snoring sounds and opening the mouth. The bird usually dies 

 in about six to eight days. The disease is confined exclusively to 

 geese. 



On autopsy the air sacs are noted to appear yellowish in color, 

 with their inner surfaces covered with a fibrinous material. Similar 

 deposits are found on the serous surfaces of the liver, spleen, intes- 

 tines and peritoneum. 



CONTAGIOUS NASAL CATARRH OF BIRDS 



This condition has been called Coryza avium contagiosa. 

 Cause. — This disease can be reproduced by ex])eri mental 

 inoculation. It occurs ('|)i/o()ticany. mostly amonii' young 



