DESCRIPTION OF AN ENCHONDROMATOTJS TUMOUR. 127 
section, was two and a quarter, and its diameter on its long axis 
three inches. This apparent want of correspondence in propor- 
tion between the diameters and circumference is due to its 
irregularity of surface. Internally it was composed of calcareous 
matter, white fibrous tissue, and of a substance presenting all 
the physical characteristics of soft cartilage, which latter is the 
predominating material. The fibrous tissue in connexion with 
the calcareous substance formed a kind of coarse net or frame 
work, within the meshes of which the cartilaginous substance 
was contained. In no part of the tumour did the calcareous 
matter assume any definite structure approaching that of true 
anatomical bone, but was coarsely granular, and easil} T divisible 
by the knife. In two places within the tumour the fibrous and 
calcareous substances are so arranged as to form cavities, irre- 
gular in outline, the larger of which would contain an ordinary- 
sized marble, and the other a pea; both of these were filled 
with clots of coagulated blood. The situation of these two 
cavities was about the centre of its long circumference, nearer 
to its external sarface than its central part internally. Several 
other portions of the tumour were also coloured by contained 
blood, in similar irregular cavities, but less in dimensions; the 
blood being diffused more equally causing a uniform pink hue 
to pervade a portion of its substance, having a circumferent line 
of about three inches, and about half an inch in depth. 
Mr. Barlow, the talented lecturer and demonstrator of this 
school, has very kindly furnished me with the following ac- 
count of the appearances which the tumour exhibits under the 
microscope ; and I will here take the opportunity of acknow- 
ledging my obligation to Mr. Barlow for his kindness in sup- 
plying me with this description of its appearance when sub- 
jected to microscopical examination. 
He describes it as follows : — “ The tumour was carefully 
examined by making thin sections of the various tissues com- 
posing it, and, when viewed with a magnifying power of 300 
linears, these exhibit the following appearances, which are those 
usually found in enchondromatous tumours : — 
“ The fibrous tissue which enters from without is disposed 
in webs or strands, the individual fibres of which are pre- 
cisely the same in structure as those constituting ordinary 
areolar tissue : they are densely interlaced, and rarely run 
parallel in any considerable numbers. 
“ The calcareous material in some places is mixed with the 
fibrous tissue, and in other parts supplies its place by forming 
the frame-work of the tumour : it consists merely of a crystalline 
deposit of the ordinary inorganic constituents of bone. No 
traces of Haversian canals or lacuna: can be seen : the sub- 
