698 
C. E CLAYTON. 
MALIGNANT GROWTHS IN THE NASAL SINUSES. 
By C. E. Clayton, D. V. S., New York City. 
Read before the Veterinary Medical Association of New York County at its December 
Meeting. 
In presenting these few remarks on malignant growths ii 
the nasal sinuses, I do not do so with the view of naming or de 
scribing all of them, but simply those which are most frequently 
met with and which it has been my good fortune to see and hold 
post-mortems upon, and also to present for your observation a 
slide made from a section of the last case I had. It is to Dr. C. 
C. Howard that I am indebted for this most excellent specimen 
and its exact nature, which Heitzmann describes and illustrates 
as epithelioma. 
When these cases come under my observation I am always 
painfully reminded of my inability to tell their exact nature 
after viewing them with a microscope, due to my limited 
knowledge of normal histology. While it is an easy matter to 
study the subject and answer any questions one might be asked 
at an examination, it is far different in the actual examination 
of specimens. To be sure, if we make a slide from any part of 
the body we know what it is when looking at it, but should we 
be given a specimen without a history to examine, how many 
would know correctly what it was ? I for one would hesitate 
in answering. 
So we find that a knowledge of normal histology, not theo¬ 
retical but practical, is what is wanted, or how are we ever going 
to appreciate or recognize the pathological changes which take 
place in disease, and it is in the latter condition with which 
we have to deal, and unfortunately for us it was not given to a 
great extent during our college course, but at present it is receiv¬ 
ing the consideration it deserves. 
Granting that our knowledge of pathological histology is 
limited, by what means are we to make up the deficiency in our 
clinical observations ? I will give those which are most useful 
to me. 
