204 
A. ZUNDEL. 
rise to very serious lameness, preventing the animal from stand¬ 
ing, and rendering the movement of walking very painful. The 
horn of the frog often becomes soft and thready, when the frog 
is called rotten , and the softness increases until it drops off by 
piecemeal. 
The causes of this affection are, first, excessive work on stony 
loads; changes from excessive dryness to moisture ; the strong 
muds of stieets, and standing in damp and dirty places, especially 
in mine and manure, as is often the case in badly kept stables. 
But there are horses whose feet are also affected with thrushes 
even when standing on a dry bedding ; those whose feet are con¬ 
tacted; and again, well-bred horses with good frogs, and in which 
there is a constitutional tendency to that condition of the horny 
structures. 
The treatment consists in avoiding all known causes likely to 
give lise to this morbid condition of the frog. Sometimes the 
foot must be pared, and all the parts where the puriform secre¬ 
tion collects exposed and thoroughly cleansed. The lacunse of 
the frog are then to be dressed with Villate’s solution, ^Bgypt- 
iacum ointment, and sometimes only with simple drying powders, 
a mixture of subacetate of copper, burnt alum and tannin. When 
the pain is excessive, glycerine, with a little Goulard’s extract or 
pci -chloride of iron, is very beneficial. In some cases again, ex¬ 
cellent results are obtained by poulticing. It is certain that 
pioper shoeing must, in many instances, be of great advantage. 
(L) Furuncle of the Ieog. —Under this name is understood 
the pai tial neciosis of that portion of the plantar cushion which 
is situated above the frog proper, from a bruise of that part of 
the hoof. Loiset describes it under the name of plantarfibro-chon- 
dritis , connecting it with quittor, which he named lateral fibro- 
chondritis . 
(I) Symptoms .—There is nearly always, and especially at 
the outset, a severe lameness, the greater in degree as the morti¬ 
fication is more extended and more deeply situated. While stand¬ 
ing, the affected leg is carried forward, resting on the toe ; the 
heels are raised, and the fetlock is half flexed. In action, the rest 
is very slight, sometimes quite absent, and occurs on the toe only. 
