ZOOLOGICAL DISTRIBUTION OF DISEASE, 269 
objects for veneration. In addition to the modes of 
origin mentioned, horns may arise from the overgrowth 
of nails, and also in the scars of burns; these have no 
connection with our present study. 
Horns arising in sebaceous cysts, or from warts, have 
been recorded in man, oxen, sheep (fig. 133), goats, dogs, 
FIG. 133.—The head of a Sheep with a large wart-horn on its 
- head. 
and hare. I have recently seen one growing near the 
hock of aneland : in birds they have been recorded in the 
parrot, greenfinch, linnet, canary, and oyster-catcher. 
The museum of the Royal College of Surgeons, London, 
contains an admirable collection of such horns, one of 
them which grew from the flank of a ram, and from its 
structure is clearly a wart-horn, is the largest on record, 
