INFLAMMATORY AFFECTIONS 303 
word here. Keratoma may thus be used to describe what 
we have called keraphyllocele directly that growth makes 
its appearance at the sole, and is there able to be cut with 
the knife. Similar hard and condensed growths may, how- 
ever, make their appearance on the sole in other positions 
quite removed from the white line, plainly being secreted 
by the villous tissue of the sensitive sole, and having no 
connection whatever with the sensitive lamine. They 
appear as circular patches, varying in size from a shilling 
to a two-shilling piece. Compared with the surrounding 
horn, they stand out white and glistening, while in struc- 
ture they are dense and hard, and offer a certain amount 
of resistance to the knife. They are of quite minor impor- 
tance, and, beyond keeping them well pared down, need no 
attention. Keratoma probably offers us the best analogy 
we have to corn of the human subject. 
5. Turusa. 
Definition.—A disease of the frog characterized by a dis- 
charge from it of a black and offensive pus, and accompanied 
by more or less wasting of the organ. 
Causes.—The primary cause of this affection is doubtless 
the infection of the horn, and later the sensitive structures, 
with matter from the ground. Those factors, therefore, 
leading to deterioration of the horn, and so exposing it to 
infection, may be considered here. Such will be changes 
from excessive dampness to dryness, or vice verséd; work 
upon hard and stony roads; prolonged standing in the 
accumulated wet and filth of insanitary stables, or long 
standing upon a bedding which, although dry, is of unsuit- 
able material. 
In this latter connection may be mentioned the harm 
resulting from the use of certain varieties of moss litter. 
This we find pointed out by J. Roalfe Cox, F.R.C.V.S.* 
Tenderness in the foot was first noticed, and, on examina- 
tion, the horn of the sole and of the frog was found to be 
* Veterinary Journal, vol. xvi., p. 248. 
