Callous Tumour. 281 
nish or destroy effusions so necessary to reco- 
very ; it will therefore be easy to shew the 
necessity of them from the consequences aris- 
ing out of their scanty formation, or destruc- 
tion when formed. 
Of the failure of effusion, from both the 
external and the internal membrane. 
Exp. 5. Sixty hours after fracture.—T he 
animal was languid and refused food ; the 
limb felt flabby, and no tumour encompassed 
the fracture. Upon examining the limb, 
both portions of the fracture were found ly- 
ing immediately under the common integu- 
ments, and denuded of external membrane ; 
above the denudation the membrane was 
thickened, and its blood vessels numer- 
ous, enlarged and turgid ; the internal mem- 
brane of each portion was diseased and ea- 
sily separated from the bone, leaving the ca- 
nal bare. There was no effusion from the 
external membrane surrounding the injury, 
nor any from the internal, smoothing the face 
and asperities of the fracture. The adjacent 
muscles were highly diseased, and a bloody 
sanious fluid was extensively diffused in the 
cellular membrane. 
VOL. Il. Nn 
