CASES OF EUSTACHIOTOMY AND TRACHEOTOMY. 537 
protracted character. The tumefaction under the jaw was not so 
large. The bowels not much affected — the arterial action, which 
was at the commencement invariably accelerated, was kept down 
by the use of acid, hydrocyanici, given in aqua frigida after ve- 
nesection. I also applied blisters to the throat. 
In some cases which occurred in the aged horses I bled freely, 
gave the acid in 53 doses bis in diem, inserted a seton under the 
larynx, and applied blisters. I also kept the bowels open by 
injections. 
After the patients had so far recovered as to take bran mashes, I 
gave about mag. sulph. §vj, dissolved and mixed with the mashes, 
which acted on the bowels and urinary organs. In two of the 
one-year-old colts the suppurative process went on, as in the case 
already related. In despite of all my endeavours, an accumula- 
tion of pus took place in the eustachian cavity, and began to 
assume a most alarming character, and which would ultimately 
have terminated fatally if relief had not been immediately ob- 
tained. To open the eustachian cavity was a dangerous opera- 
tion, but I had no other alternative. I studied the parts well, 
and questioned myself again and again on the propriety or im- 
propriety of so dangerous a proceeding. I at length determined, 
at all hazard, to operate, being encouraged by the worthy Baronet 
to do my utmost, and save the colts if possible. 
I proceeded with the operation in the following manner. At 
the angle formed by the inferior and anterior border of the wing 
of the atlas and the posterior ridge of the stylo-maxillaris — inferi- 
orly by the superior occipital branch of the jugular, and poste- 
riorly by the ramus-anastomaticus, and part of the parotid gland 
— within this angle or space formed as above, I cut down through 
the integument, and carefully dissected away some muscular 
and cellular tissue. I then laid bare the ramus and the abovemen- 
tioned parts — drew part of the parotid gland forward, and with a 
small trocar opened the guttural cavities. I then withdrew the 
trocar, leaving the canula, which I secured by tape placed round 
the colt’s neck, and allowed it to remain in for three or four days. 
The pus continued to escape for at least a quarter of an hour. Not 
less than a quart of it flowed out. The canula was small, and only 
required to have the trocar put up it at times, on account of its 
filling being obstructed by the pus. The operation gave imme- 
diate relief, and the colts soon got well. 
In one case, about the period of convalescence, three large 
abscesses formed, one on each biceps abductor tibialis, opposite 
the tuberosity of the ischium, and the third opposite the cricoid 
cartilage. Some small ones also formed at the commissures of the 
lips : these abscesses were very troublesome. After opening, they 
