272 DISEASES OF DOMESTICATED BIRDS 
and the cut section has a slight shiny appearance. There are ob- 
served whitish threads of connective tissue between which there are 
darker islands of tissue. Blood vessels seem somewhat scarce. No 
lesions are observed in the internal organs. Microscopic examina- 
tion leads to the diagnosis of small spindle-cell sarcoma. 
LYMPHO SARCOMA 
Regenbogen has described a case of multiple sarcomata of the 
skin of a hen two years old. The subject is in good condition, dis- 
plays good appetite and is active. A number of tumors are located 
on the head, neck, and back. These are of various sizes; one involv- 
ing the left eye is 4 cm. in diameter. The surface of this tumor 
is uneven. The center appears dark brown as a result of the pres- 
ence of scabs and crusts. The periphery of the tumor shows the 
color of the skin and is thrown up in a circular ridge. The tumor 
extends above to the comb, below to the ear wattle, forward to the 
corner of the mouth and deep in the orbit. The other tumors move 
freely within the skin and are sharply defined from surrounding tis- 
sues. On the cut surface they are grayish white in color, smooth 
and fatty. The center of the surface of the larger tumors has under- 
gone an ulcerative degeneration. 
Microscopic examination shows round cells for the most part. 
Between these is a scanty and delicate reticular foundation struc- 
ture. The vessels appear throughout as thin walled canals between 
the cell masses. From this it is seen that the tumor is a small round 
cell sarcoma, for instance, a lymphosarcoma. 
Ziirn and Pauly have observed diffuse round cell sarcomata in the 
liver of hens, and Watson has reported upon a round cell sarcoma in 
the heart of a fowl. . 
MELANOSIS 
Lewin described a case of general melanosis in a young slaughtered 
hen. The bird had coal black feathers, beak and legs. The comb 
was dark red, the tongue and oral mucosa, black. After removing the 
feathers, the whole body appeared bluish black, the musculature shone 
bright through the skin and after removal of the skin, appeared un- 
altered. The loose tissues between the muscle groups contained 
black patches of various sizes and shapes. After opening the body 
cavity the serous surface was observed to be completely black, as was 
