1G4 POULTRY DISEASES 



Avliich is arranged in Ininclles between the nests. The cells 

 are of the epithelioma type. There may be observed necros- 

 ing foci. 



Birds having contagious epithelioma always die, while those 

 with chicken pox show a very large percentage of recoveries. 

 The two diseases are easily distinguishable. 



SARCOMA 



Sarcomata are a type of malignant tumors; that is, they 

 spread in much the same manner as cancers (carcinoma). 

 They are fatal in time. The flesh of birds affected with sar- 

 coma should not be eaten. 



A case of sarcoma was studied by the writer, in which the 

 tumors involved the ovary, intestines, peritoneum (lining of 

 the abdominal cavity) and the liver. These tumors vary in 

 size, are whitish-yellow, and soft when sectioned. The study 

 under the microscope showed it to be a spindle celled sarcoma. 



Rous has reproduced spindle celled sarcoma by transplant- 

 ing portions of a sarcoma obtained from a Brown Leghorn 

 hen, into the breast of both Barred Plymouth Rocks and Leg- 

 horns. He obtained better growths from the inoculations 

 into the Plvmouth Rocks. 



The filtrate also produced sarcoma but the tumors did not 

 appear until several months had elapsed after the inoculation 

 of the filtrate. 



Round-celled sarcomata are often found in the fowl. We 



have succeeded in transplanting a round-celled sarcoma from 



a Single Comb White Leghorn hen into a Partridge Plymouth 



Rock Cockerel. 



TERATOMA 



An interesting case of teratoma in a black Wyandotte cock about 

 twenty-one months old is described by I\Ir. Sheathes in the Journal 

 of Comparative Pathology. (Vol. XXIV, part 2). 



The tumor was found in the abdominal cavity and involved the 

 mesentery. The left testicle was absent. The growth measured 

 Hx4x6 inches and was enclosed by a thin, fibrinous membrane. The 

 tumor mass consisted of a multitude of cysts ranging up to the 

 size of a pea, islands of cartilage, cavities lined with stratified 

 epithelium and minute feathers. The conclusion was drawn that 

 this tumor probably originated from the left testicle. 



ADENOMA 



An adenoma is a tumor that has some resem])lance to a 

 normal gland. Tt is made up of connective tissue and asini, 

 or cavities, lined bv columnar or cul)oidal cells. One tumor 

 of this type affecting the spleen of a hen was sent to the 

 laboratory. The spleen was al)oiit twice normal size. 



