REMARKS ON MU. CHERRY’S PAPER ON CORONIT1S. 499 
a case simulating that disorder spoken of by Mr. C. ; but 1 cannot 
see by what method of reasoning we are to attribute its appear- 
ance to inflammation of the coronary substance (coronitis) ; for if 
we turn our attention to the other structures concerned in com- 
pleting the horny case, beside that of the crust or wall, we shall 
find that they also, as was the case in the above instance, partici- 
pate in the general disorder. The sole will be found to shell off' 
much more readily than from a healthy foot, owing, no doubt, to 
diminished and abnormal secretion, with increased brittleness ; and 
the frog, if not found affected with thrush, as in most instances it 
will be, is hard, dry, and inelastic, and not, perhaps, more than 
above half its natural size. 
Returning now to the causes of the appearances just described, 
it will be recollected that I was speaking of the irritable dispo- 
sition of the sensible parts of the foot ; and I doubt not that there 
are many who have had proof sufficiently convincing of the truth 
of that which I am about to state, particularly those to whose lot 
it has fallen to have the superintendence of a forge. 
The better to be understood, I will suppose a case : — A horse, 
perfectly sound, was brought a week ago to be newly shod. He 
was shod as usual, and has ever since been at work, but is now 
brought back, with a statement that he has gone somewhat feel- 
ingly ever since those last new shoes were applied, gradually 
getting worse.. His shoes are taken off, and applied again with 
some slight alteration in the nails, or not so tight, as .it is said, and 
he is again taken to work with the expectation that it will go off, 
instead of which he continues to get worse, until at length he is 
obliged to be taken from his work altogether, and turned out or 
kept quiet in the stable for a much longer time than very many 
persons would expect before he recovers his usual soundness. 
What was the cause of this lengthened lameness ? An answer is 
easily obtained. The horse at first was lamed from pressure of 
the nails, but, not being of that severe nature which will unfit him 
for service, he is kept at work, gradually becoming worse, until at 
last there becomes- such a degree of irritation, not to say inflamma- 
tion, set up in the internal structures, that very great attention and 
a lengthened rest are found necessary to dissipate it. If, however, 
he is taken to work again previous to the injured parts having 
perfectly established their usual tenacity, we must expect, and, 
indeed, too often find, a lingering disease to follow. The secretions 
being for a time increased and then again diminished, according to 
the peculiarities of the case, cause those rings to be produced, 
which by all are considered as characteristic of a brittle and fever- 
ish disposition of feet. 
The coronary substance, although it must be considered by us 
