VETERINARY MEDICAL SOCIETY. 
473 
Professor Coleman in the Chair . 
Professor Coleman remarked, that canker appeared oftener 
1 the hind legs than the foreoftener in winter than in summer; 
ad that the crust grew more abundantly. He saw a case in 
hich the whole of the horn was removed from the frog and sole, 
et the crust was strong, and six or seven inches deep. The 
eight of the animal was perfectly sustained by the laminae. 
Mr. J. PercivalL— In early stages thrush is connected with it; 
et they are diseases of a different nature, and the discharge is 
ifferent. 
Mr. Mavor. —In many cases canker soon follows a bad thrush. 
Professor Coleman. —Canker is often the consequence of grease, 
t attacks horses with white legs and thick skins, and much hair 
n the legs. 
Mr. Henderson had one case of canker with no disposition to ^ 
rease, but very high heels. Another more disposed to grease 
ad greater secretion of horn in the affected foot. 
Professor Coleman .-—Grease and canker are both concerned in 
lie increased growth of horn; both are now very rare among 
avalry horses: where one case now occurs there used to be one 
undred. This is an interesting circumstance: more attention is 
ow paid to frog pressure. 
Mr. Goodwin related the case of a large cart-horse. A farrier 
indertook to kill or cure him. He cured the canker in one leg, 
>ut sad grease immediately attacked both : therefore he imagined 
hat frog pressure could not have any thing to do with the disease 
•ccurring in the opposite foot. 
Professor Coleman. —Does Mr. Goodwin think the appearance 
>f grease in both feet was the consequence of the cure of canker 
n the one ? 
Mr. Goodwin. —It must have been, in a great measure, consti- 
utional. Canker often occurs from injury. He saw a horse 
vhich had been dismissed from the College as cured. It was 
umed out, and soon became lame. He found a small separation 
)etween the horny and the sensible sole; and, on searching far- 
her, a very considerable separation between the crust and laminae, 
md extending up to the coronet. Some parts of the surface were 
covered with horn, others quite exposed. 
Mr. Field. —The wound on the lower surface might have healed, 
yet the concavity might have remained, which, in the natural 
growth, coming nearer to the surface, might have caused lame¬ 
ness. As to the growth of horn, where there is great determina¬ 
tion of blood to the foot, if the foot be subject to considerable 
pressure, there is no extra growth of horn. There may be great 
