to take a record of the other symptoms, he knows that it is but the commencement of the end.  Methodically, however, he notes the other conditions.  The pulse he finds small and imperceptible, save at the radial.  The thermometer registers a subnormal temperature, the extremities are cold, and cold sweats bedew the body.  To the same experienced eye the countenance of the animal is almost suggestive of what has occurred.  The drawn and haggard expression, to which we have previously referred, becomes more marked, and the angles of the lips are drawn back in what has been described by some writers as a ‘sardonic’ grin.

We can best express what the whole look of the animal’s countenance indicates to us by saying that it gives us the impression that the animal himself knows that some serious change, and a change fatally inimical to his chances of life, has taken place in his feet.

It may be that in some odd cases, although it has not yet been our lot to meet with them, gangrene may terminate in the casting off of one or more hoofs.  Needless to say, there can still be but one termination to the case.

(d) Periostitis and Ostitis.—­This complication is referred to by other writers under the term of ‘Peditis.’  It signifies, of course, that the periosteum and the bone have become invaded by the inflammatory process.  It is our opinion that these two conditions, even including an actual arthritis, always exist, even in an attack of laminitis that ends favourably.  We do not claim, however, to be able to relate any means, save that of post-mortem examination, by which it may be singled out from the other changes occurring in the foot.  The high fever and pain occasioned by the inroads of the inflammation into the other sensitive structures serves to effectually mask whatever evidence of it we might otherwise obtain.  It may be sometimes only small in degree, but we feel confident that inflammation, at any rate of the outer layer of the periosteum, is in laminitis constant even, we repeat, in a mild case.

[Illustration:  FIG. 118.—­SHOWING CHANGES IN THE OS PEDIS WITH LAMINITIS OF LONG STANDING, (a, Viewed from the front; b, viewed from the side.) The porous condition of the bone, which is here shown, is a result of a rarefying or rarefactive ostitis.  This specimen also illustrated (what the photograph cannot show) an accompanying condition of condensation of bone, or osteoplastic ostitis. (For a fuller description of the changes occurring in these forms of ostitis, see Chapter XI.)]

When the case is a serious one we have ample evidence to show that ostitis exists, and exists in a severe form.  The bones become vastly altered in shape, a process of absorption leads to the formation of large, irregular cavities within their substance, and what of the bone is left is rendered hard and ivory-like (condensed) near what was the original centre, while the edges and other portions show often a tendency to become brittle and porous.