360 
REPORTS OF OASES. 
size from that, of an almond to that of an apricot, are all found 
on the left side, as far as my observation goes, which would seem 
to be due to the circumstance that the horses generally masticate 
their feed more on the left row of grinders than on the right one. 
The centre of all these calculi appears to be either of wild 
oats or barley. The feed used around Stockton for horses is 
crushed barley and hay, which latter is either barley, snmmei- 
fallowcd wheat or wild oats. This hay is generally full of grain. 
Now, it can be easily understood that during the act of mastica¬ 
tion some hay is pressed between the grinders and the cheek, and 
thus a grain is likely to enter one of the numerous little glandu- 
lary ducts lining the molar teeth, and there forming the nucleus 
of a salivary calculus. 
Now, I wish to call the attention of my colleagues to the loca¬ 
tion of these concretions. My first impression on seeing them 
was that they were primitively formed in the Stenian duct; be¬ 
sides, I never heard or read of the possibility of calculi foiming 
outside of the ducts of the parotid and maxillary glands, so I was 
in doubt for some time as to which those I saw really belonged 
to. But after close examination I came to the opinion that they 
were connected with the superior molar glands. They were all 
located one inch ahead of the Stenian duct, opposite the second 
superior molar tooth, easily movable in all directions between the 
buccal membrane and the alveolo-labial muscle, without causing 
any pain or disturbance except in some cases, where the concre¬ 
tion had such large dimensions as to push the membrane between 
the teeth during the act of mastication. Besides, I never did 
find any sign of inflammation of late or ancient date ; nor have I 
learned through careful inquiries of such farmers as owned horses 
bearing a salivary calculus that there ever was any swelling no¬ 
ticed around the head, which convinced me that there never was 
any change in the size or appearance of the parotid gland or its 
duct. Another circumstance worthy of notice is that the wounds 
caused by the extraction of these calculi healed all up in a very 
short time without ending in a salivary fistula, which would be 
very often the case if they were found in the Stenian duct. My 
only purpose in publishing these remarks was to call the atten- 
