Callous ‘Tumour. © 277 
time always elapses, the powers of the con- 
stitution seem to suffer an immediate depres- 
sion in proportion to the violence and extent 
of the local injury, and to those exertions 
which will be required to perfect a process of 
reparation. In the case of simple fracture, 
these actions of reunion commence so early 
as within the twelfth hour. 
Of effusion Srom the internal membrane. 
Expr. 2. Twelve hours after fracture.— 
The muscles surrounding the injury had suf- 
fered severely ; no perceptible changes had 
taken place in the external membrane; the 
fractured faces were covered and made beau- 
tifully smooth by an effusion of coagulable 
lymph firmly adherent to the internal perios- 
teum, and evidently err from that 
membrane. 
This capping or smoothing of the face of 
the fracture is one of great moment, since 
by it the asperities of the imjured bone are 
removed, and further violence to the sur- 
rounding soft parts prevented. _Whena frac- 
ture is going on well, this effusion may als 
ways be early found, by examining the parts 
after destroying the aniinal ; it adheres firmly 
