OSSEOUS TUMOUR. 
83 
form, very solid, but somewhat convoluted on its surface. 
No. 2 has a form and aspect not very unlike the brain. In 
its long diameter it measures 6 in., and 5 in. in its short. 
It also is solid throughout. It weighs 4 lb. 15 oz. No. 3 
weighs 4 lb. 14 oz., and is ovoid in form, having a thin but 
elongated point of attachment on its one side. Its long- 
diameter measures 7 in., and its short 4 in. It was attached 
to the inner side of the lower jaw of a horse, but no sufficient 
history belongs to the other specimens, although tradition 
assigns the larger one to having been growing from the skull 
of a cow. 
The specimen sent by Mr. Cartledge is spheroidal in form, 
and of a size somewhat larger than a cricket-ball, its circum¬ 
ference being in one direction 114 in., and in the opposite 
104 in. It is very compact and solid, and weighs 1 lb. 54 oz. 
The surface, which is irregularly nodulated, is deeply marked 
also in several places with furrows by the blood-vessels 
which ramified upon it. At one spot it shows the remains 
of a small pedicle by which it was attached. On section, the 
tumour presented the ordinary appearance of these growths, 
no dentine (ivory) or other tooth-structure being present. 
The Haversian system was found to be very complete, both 
in size and development, but wanting that uniformity of 
arrangement met with in normal bone. The tumour had 
originally been formed within the maxillary sinus on the 
left side of the face, its base resting upon the upper 
extremities of the alveoli of the fourth and fifth molars 
in particular. In process of development it led to absorp¬ 
tion of the osseous walls of the alveolus of the fifth molar, 
so as to slightly expose the fangs of the tooth, and lead 
to its lying partially in contact therewith. Its growth in¬ 
wards effected the removal almost entirely of the bony par¬ 
tition between the maxillary sinus and the nasal cavity, thus 
not only bringing its greatest portion within the ordinary 
air-passage, but its surface in contact ultimately with the 
septum nasi. The surrounding bones, however, do not pre¬ 
sent any evidence of disease, either of their tissue or their 
coverings. The location of so much of the tumour within 
the nasal cavity must have caused a considerable impediment 
to respiration, which probably was one of the chief reasons 
why the horse was destroyed.] 
