238 DiMfies of Poultry 



the nostrils, angles of the mouth, lobes of the ear, parts 

 adjacent tt) the auditory meatus, wattles, surface of the face, 

 edges of the eyelids, intermaxillary space, and especially the 

 comb. They sometimes spread over the feathered parts of 

 the head, throat and neck, and may occur on the outer 

 surface of the thighs, abdomen, under the wings and in the 

 vicinity of the cloaca. At first these epitheliomata appear 

 in the skin, as flat nodules, which soon become prominent, 

 and which vary in size from a poppy seed to a millet seed. 

 Later on, they usually attain the size of a hemp seed. They 

 are of a reddish-gray or yellowish-gray color, often show 

 distinctly in their earlier stages of development a peculiar 

 greasy, nacreous luster ; and are rather firm to the touch. 

 Their surface soon becomes covered with a dirty-gray, 

 yellowish-brown or red-brown crust. They are discrete 

 and disseminated in considerable numbers on the erectile 

 tissues, etc. They vary in size according to their age ; and 

 frequently lie rather close to one another, so that the affected 

 parts look as if coarsely granulated ; or they are crowded 

 together in such a manner as to give the appearance of large 

 warts with divisions through them, or mulberry-like hyper- 

 trophies. Even single nodules, to say nothing of the groups, 

 may attain the size of a lentU, pea, cherry-stone, broad bean 

 or larger object. The older they become, the rougher and 

 more covered with knobs will be their incrusted surface. 

 "If the edges of the eye-lids be affected by these tumors, 

 the lids will become nodular, swollen and closed. The con- 

 junctiva in this case also suffers ; it projects outwards be- 

 cause catarrhally inflamed ; assumes a yellowish color at the 

 seat of eruption ; and its surface becomes covered with crusts. 

 Purulent conjunctivitis may appear and the inflammation 

 may spread to the sclerotic and cornea, with keratitis and 

 panophthalmia as the result. If, as sometimes happens with 

 pigeons, the eruption of nodules extends over the whole of 



