FISTULOUS WITHERS, ETC. 
889 
_ 
larged when worked with a collar. Upon examination a small 
tumor was found to exist just under the skin in the bearing 
region of the collar at the point of the shoulder and above the 
mastoido-humeralis muscle. This tumor was excised and found 
to contain but a scant amount of pus, from which tubes of 
bouillon and agar were inoculated. These cultures were pure 
of a yellow micrococcus. This organism proved to be patho¬ 
genic to rabbits, and pure cultures inoculated into two different 
horses produced extensive abscess formation at the points of 
inoculation, viz., point of the shoulder, withers and gluteal 
region. 
Case XVIII .—Clinic No. 2140, Dec. 4, 1899. Patient, a 
brown gelding, weight 1000 lbs., 8 years old ; used for general 
farm work. About May 1st some swelling was noticed at the 
point of the left shoulder. The horse has worked regularly 
ever since. When presented at the clinic there was a swelling 
about the size of a goose egg at the point of the shoulder. 
There was also fluctuation beneath the mastoido-humeralis 
muscle. Incision was made at this point and a pus cavity situ¬ 
ated deeply between the muscles evacuated and about a large 
thimbleful of a rich yellow pus obtained, from which tubes of 
bouillon were inoculated. These were pure cultures of a yel¬ 
low micrococcus. 
Case XIX .—Clinic No. 2185, Jan. 4, 1900. Patient, a grey 
mare, weight 1000 lbs., 7 years old ; has been worked in team at 
farm work and hauling. Two weeks before examined in clinic 
marked swelling and tenderness under the collar at the point of 
the shoulder was noticed, but the animal was continued in work. 
When seen at the clinic there was considerable swelling- at the 
point of the right shoulder, hard and exceedingly tender. It was 
freely incised, and after cutting through about two inches of mus¬ 
cles two separate cavities were evacuated of a small amount of pus, 
from which tubes of bouillon and agar were inoculated. These 
developed and gave pure cultures of a yellow micrococcus. 
Case XX .—Clinic No. 2204, Jan. 13, 1900. Patient, a brown 
horse, weight 1050 lbs., 8 years old, and used for general farm 
work. Has been hauling logs all winter and about two weeks 
previous a swelling the size of two fists was noticed at the 
point of the right shoulder and has been increasing ever since. 
Animal was laid up and kept on straw after this swelling ap¬ 
peared. When first seen in the clinic there was an enlargement 
on the right shoulder the size of a four-quart measure in front 
of the scapulo-humeral articulation. Swelling extends up the 
