290 Observations upon the 
perfectly defined, but extending irregularly 
into the cellular membrane and amongst the 
lacerated fibres of the muscles. Upon cut- 
- ting into the tumour, a little bloody slippery 
fluid escaped from a cavity, the interior of 
which was ragged and crossed in various di- 
rections by numerous slender fibres ;_ the frac- 
ture was very oblique, and the extreme point 
of the lower portion projected uncovered into ~ 
this cavity. The superior portion presented 
a natural appearance, was embedded in the 
tumour, and not communicating with the ca- 
vity. The tumour encircling the injury, was 
more dense internally than externally, and so 
closely and intimately connected with the 
external membrane, that when forcibly pul- 
led, it detached that part from the bone, 
leaving it studded with innumerable bloody 
points. 
Exp. 15. One hundred and _ninety-four 
hours after fracture.—There was a consider- 
able firm tumour encircling the fracture ; in 
the centre of the tumour was found a small ca- 
vity, containing a slippery glairy fluid, into 
which projected, uncovered, a portion of the 
face of the superior part of the bone. The 
other appearances were similar to those in the 
two last cases, except that a greater organi- 
