278 Observations upon the 
tothe face of the fracture ; it is also very con- 
stant, even when the fracture goes on ill, at 
which time it lies looser upon the face of the 
fracture, is scantier, and when seized with 
the forceps, comes away, bringing along with 
it a portion of the internal membrane, and 
leaving the eavity of the bone partially de- 
nuded, thus demonstrating the source from 
whence its origin is derived. Thisisthe first 
effusion, and although the situation of the 
internal membrane is sach, as to prevent our 
demonstrating the increased action of its ves- 
sels, except by delicate and fortunate injec- 
tions, yet the appearance of this effusion is 
proof that such a state of them exists. In- 
creased action therefore of the vessels of the 
internal membrane of the bone, and effusion 
of coagulable lymph from them, capping and 
smoothing the faces of the fracture, may be 
considered the first process towards the repa- 
ration of the injury. 
Of effusion from the external membrane. 
Exp. 3. Twenty-four hours after frac- 
ture.—The extravasated blood was of a dark 
colour; there was considerable laceration ‘of 
the surrounding muscles, which were vascular 
