NASAL GLEET. 93 
position of the head even cannot entirely dislodge it, as the head is 
seldom carried perpendicularly. Here the pus hardens or concretes, 
until by degrees the cavities are filled with a foul and solid matter. 
THE TURBINATED BONE WITHIN THE NOSTRIL PART OF A HORSt’S HEAD WHICH HAS 
OF A HORSE AFFECTED WITH NASAL GLEET; THE BONE TREPHINED 80 AS TO EN- 
PARTLY ABSORBED BY PRESSURE AND PARTLY ABLE THE SURGEON TO EMPTY THE 
DISTENDED BY AN ACCUMULATION OF CON- TURBINATED BONE. THE COURSE OF 
CRETE PUS. THE NERVES IS SHOWN. 
Such a store-house of disease may thus be opened and cleansed. Mark 
with chalk or charcoal the spot in a line with the infra-orbital foramen, 
and a little anterior to the third molar tooth ; the positions of both may 
be clearly ascertained by feeling externally upon the head of the living 
horse. At that place cut through the skin, but no deeper. Make a T 
incision, only reverse the letter L. Withdraw the two flaps of skin; 
remove by means of blunt hooks any structures that conceal the bone, 
upon which last, when clear, employ the trephine. 
The side of the face being opened, insert through the opening a steel 
probe. Thrust it through the concrete pus, and strive to discover the 
most depending portion of the sac. To this spot, if possible, apply a 
hollow metallic tube, about twelve inches long. This instrument has a 
horn-shaped mouth at the blunt extremity, and a fine sharp steel saw at 
the other. The saw being fixed upon the spot indicated by the probe, 
and a few revolutions being given to the horn-shaped end, between the 
Fic. 2. 
Fig. 1. The hollow metallic tube, h wing at one extremity a horn-shaped mouth for the convenience 
of inserting a gum-elastic probe, and at the other end a fine saw for cutting through the turbinated bone. 
Fig. 2. a. A gum-elastic probe to be threaded through the metallic tube, and so forced out of the nos- 
tril. 6. A portion of string passed through the cye of the probe and forming a loop. c. The tape which 
constitutes the seton passed through the looped string. 
palms of the hands, a circular portion of the bony net-work which char- 
acterizes the turbinated structures is removed. 
Now, so soon as this is accomplished, force through the hollow instru- 
