DISEASES OF THE JOINTS 421 
slight improvement in the symptoms. Here, with a suitable 
treatment, and with a patient of a particularly robust con- 
stitution, the case appears to turn, and slowly but surely 
progresses towards the only end we can hope for—namely, 
a more or less painless anchylosis of the articulation. 
In less favourable cases the purulent discharge continues, 
and (always a bad sign) becomes more or less chocolate- 
like in colour, distinctly thin, and stinking. The diseased 
process spreads until the ligaments of the joint, both by 
reason of their infiltration with the inflammatory discharges, 
and also on account of the ravages made on them by the 
invading pus, either greatly stretch or altogether rupture. 
The joint, after its ligaments have been destroyed in this 
manner, is loosened, and the bones are now freely movable. 
Their manipulation gives to the touch a sickening, grating 
sound—in other words, we have crepitus. This, of course, 
indicates that the articular cartilages have become greatly 
eroded by the inflammatory process, and so left what we 
may term ‘raw’ surfaces of bone to rub together. When 
the animal is put to the walk the toe of the foot is elevated, 
and the extreme mobility of the foot gives one the idea of 
fracture. With every step there is a peculiar sucking 
noise, comparable to that of a foot moving in a boot of 
water, and putrescent matter is squeezed from every opening 
each time the foot is put to the ground. Although we have 
seen cases even advanced thus far recover, it is questionable 
whether it is now wise to attempt to prolong life. Slaughter 
is far more humane, and, in our opinion, except with a 
valuable brood animal, more economical. 
If the animal is allowed to linger, other symptoms will 
nearly always present themselves before death occurs. 
Whether in slings or not, a careful watch should be kept 
upon the sound limb. For some time the patient stands 
upon it incessantly, but sooner or later it happens that a 
further visit show us the animal standing with full weight 
on the diseased foot, and making painful pawing movements 
with what before was the sound. We immediately jump to 
the conclusion ‘ laminitis.’ And so it is, but it is a laminitis 
