POULTRY DISEASES AND THEIR TREATMENT. 



151 



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 tis- 



Fig. 39. Sore-head crusts on comb, eye-lids and skill. 

 (After Gary). 



sues, etc. They vary in size according to their age; and fre- 

 quently 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 hypertrophies. Even 

 single nodules, to say nothing of the groups, may attain the size 

 of a lentil, pea, cherry-stone, broad bean or larger object. The 

 older they become the rougher, and more covered with knobs 

 will be their incrustcd surface." 



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

 lids will become nodular, swollen and closed. The conjunctiva 

 in this case also suffers ; it projects outwards because catarrhally 

 inflamed ; assumes a yellowish color at the seat of eruption ; and 

 its surface becomes covered with crusts. Purulent conjuncti- 

 vitis may appear and the inflammation may spread to the sclero- 

 tic and cornea, with keratitis and panophthalmia as the result. 

 If, as sometimes happens with pigeons, the eruption of nodules 

 extends over the whole of the skin of the eye-lids and its neigh- 

 borhood, the entire eye will become covered with mulljerry-like 

 proliferations of various sizes." 



