702 COMMUNICATION FROM B. CARTLEDGE, M.R.C.V.S. 
St. James’s Row, Sheffield ; 
Sept. 22, 1864. 
My dear Sir, —I am very much obliged to you for the 
opportunity of examining the interesting specimen of the 
ivory tumour from the nostril of the horse, and also for the 
perusal of the Veterinarian in which there is an account of it. 
I fully agree with the statement of its appearance as given 
by the editor, and also with Professor Tuson's analysis, which 
proves the true nature of it, but I cannot agree with the 
statement that “the tumour had originally been formed 
within the maxillary sinus. 5 ' I object to this on the follow¬ 
ing grounds, which I submit to your judgment. There is 
very little enlargement of the cavity of the sinus, which 
would inevitably have taken place had a bony formation 
originated in it, and gone on increasing in size until it 
produced absorption of the wall, and then escaped into the 
nostril; and there would, in that case, have been some bony 
attachment in the sinus, of which there is no appearance 
either in the cavity or on the tumour itself. And, again, 
had such been the case, there would not have been the small 
bony peduncle by which the tumour was attached to the 
bony septum of the nose. It is not in the nature of these 
tumours to form bony attachments in any other part than 
the seat of their origin. They arise from one base, be that 
base broad or narrow, and have no tendency to form adhesion 
to any bone with which, in the progress of growth, they 
come in contact. Their course is eminently destructive, 
making everything yield by the process of absorption to 
their pressure, of which your specimen is a very good 
illustration. 
In my opinion the tumour originated on the left side of 
the bony septum of the nose, as appears by the small and, 
indeed, only bony peduncle. In its growth it caused ab¬ 
sorption, by pressure, of the wall of the maxillary sinus on 
the left side, and gradually also caused absorption of the 
alveolar processes of the two molars, the fangs of which have 
likewise been absorbed. Consequently its growth has been 
from within to without , and not, as stated in the Veterinarian , 
from without to within . 
It is a matter of regret that the previous history of the 
case, during life, cannot be obtained. 
I am, my dear Sir, 
Yours very truly, 
Henry Jackson, F.R.C.S. 
B. Cartledge, Esq., M.R.C.V.S. 
