40 
JOHN GREER, JR. 
low specific gravity. The periosteum is at first thickened 
and hyperaemic, and when it is removed the underlying sur¬ 
face of the bone is found rough and uneven. 
Chemically there is a large deficiency of lime salts, and 
lactic acid is found in the bones. The general condition of 
the patient, except for intense pain, remains good for a long 
time ; the appetite is good and the internal organs perform 
their functions in a normal manner. 
The excretion of phosphates in the urine is increased ; 
lactic acid has been found. Concretions of lime are met 
with in the bladder and kidneys. 
ASPIRATION PNEUMONIA FOLLOWING ABSCESS OF STENO'S 
DUCT. 
By John Greer, Jr. 
A Paper read before the Montreal Veterinary Medical Association. 
While pneumonia in the cow is a common result of the 
ingestion of foreign and infected particles of food and other 
material into the respiratory tract, yet the present instance 
may be of interest not only as illustrating an unusual origin 
for such a disease, but as pointing the important moral that 
early treatment is an essential feature in any specific morbid 
processes in the mouths of the lower animals. 
It is a well-recognized fact that there exists normally in 
the mouth of the lower animals, pathogenic bacteria, which, 
under ordinary conditions, produce no evil effects whatever, 
so long as the animal retains a vigorous constitution ; so soon, 
however, as any factors succeed in lowering that vitality, the 
greater is the liability for bacteria to invade the general sys¬ 
tem and become truly pathogenic for their host. Such, 
indeed, appears to have been the condition in the case here¬ 
with cited. 
The subject was a three-year-old cow, in whom an abscess 
developed in Steno’s duct; the infection doubtless arising 
through the mouth after the usual manner in which such as¬ 
cending affections occur. The animal’s first symptoms were : 
falling off in the milk, which persisted for four days, when 
