Callous Tumour. 283 
similar to the above occasionally occur, when, 
instead of healing favourably, the surgeon is 
disturbed by a flabbiness of the stump, and 
a strong tendency to contraction, rendering 
stitches or adhesive bandages of no avail and 
sticceeded by a protrusion of denuded bone, 
- either through the wound or some part of the 
common integuments ; this flabbiness and 
tendency to contraction have commonly been 
attributed to disease of the soft parts, but 
are undoubtedly symptoms of disease in the 
membranes of the bone, and especially of 
the periosteum internum, in consequence of 
which, the cut face of the bone lies loose and 
unconnected in the wound, uncapped by effu- 
sion, and presenting no fit medium for the 
reciprocal extension and communication of 
blood vessels, hence Dr. M‘Donald, as quo- 
ted by Mr. Gibson in the 6th Vol. of the 
Transactions of this Society, found death of 
the bone to ensue, when the medulla was ex- 
tracted, and the cavity of the bone filled 
with dry lint. 
Of deficient or scanty effusion from the ex- 
ternal membrane. 
Exp. 7. Eighty hours after fracture.—T he 
muscles were considerably lacerated ; there 
