INFLAMMATORY AFFECTIONS 305 
found to be accumulated in the median, and often in the 
lateral, lacune. The organ is wasted and fissured, the 
horn in the depths of the lacune softened and easily de- 
tachable, and portions of the sensitive frog often laid 
bare. 
With a bad thrush lameness is present, the frog itself is 
tender to pressure, and often there is considerable heat and 
tenderness of the heels and the coronet immediately above. 
More especially is this noticeable after a journey. 
It is, perhaps, more common in the hind-feet than in the 
fore, and more often met with in heavy draught animals 
than in nags. The hind-feet are, of course, more open to 
infection by reason of their being constantly called upon to 
stand in the animal discharges in the rear of stable stand- 
ings, while it is a well-known fact that heavy animals have 
their stables kept far less clean, and their feet less assidu- 
ously cared for, than do animals of a lighter type. 
In a nag-horse with thrush of both fore-feet lameness 
becomes sometimes very great. The gait when first moved 
out from the stable is feeling and suggestive of corns, while 
progress on a road with loose stones is sometimes positively 
dangerous to the driver. 
Treatment.—When this condition has arisen, as it often 
does, from want of counter-pressure of the frog with the 
ground, this pressure must be restored after the manner 
described when dealing with the treatment of contracted 
foot (see p. 125) either by the use of tip or bar shoes, or by 
suitable pads and stopping. 
So far as direct treatment of the lesion itself is concerned, 
the first step is to carefully trim away all diseased horn 
and freely open up the lacunz in which the discharge has 
accumulated. Good results are then often arrived at by 
poulticing, afterwards followed up by suitable antiseptic 
dressings. With us a favourite one is the Sol. Hydrarg. 
Perchlor. of Tuson, used without dilution. Others use a 
dry dressing, and dust with Calomel, with a mixture of 
Sulphate of Copper, Sulphate of Zinc and Alum, or with 
Subacetate of Copper and Tannin. 
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