116 PBINCIPLES OF YETEBINAKT SUBGEEY 



usually circumscribed, more rarely represented by cauli 

 iower-like masses. They are hard, covered by horny epi 

 ihelium, the vascular supply as a rule being small. Of tk 

 other type, the condyloma, but little is known in animals. It 

 is a soft papilloma,, quite vascular, moist, and not covered 

 ■with horny epithelium, showing a granular, cauliflower-like 

 .surface. 



•Give the etiology of the papillomata ? 



Continuous irritation seems to be actively concerned. 

 Thus papilloma about the vulva seems to follow chronic dis- 

 charges, the verrucous form of dermatitis following the 

 infectious and subsequent chronic inflammation of the skin in 

 the flexion surface of the fetlock. 



Horses and cattle grazing on stubble pasture get papil- 

 lomata about the lips. Another factor is heredity ; puppies, 

 tjolts and calves are born with them. In some instances it 

 almost appears as though some infectious agent was concerned 

 in the etiology of papillomata. I have seen every calf belong- 

 ing to the South Carolina Experiment station within one 

 month become covered with warts of variable size, the animals 

 distinctly running down while affected with papillomatosis. 

 Inoculation experiments proved negative ; also histological 

 and bacteriological studies failed to throw any light upon 

 the subject. 



What animals show papillomata most frequently ? 



The horse, cattle and dog. 

 Name the seats of predilection. 



In the colt, about the lips, nostrils, eyes, ears and 

 prepuce; in older horses I have seen them most frequently 

 about the nose, on the belly and legs. In the dog, about the 

 lips, eyelids, ears, cheeks, anus, prepuce, legs, and upon the 



