440 
JOHN J. MILLAR. 
and unsatisfactory results which accompany or follow the opera* 
tion that a new method seemed inevitable, as it is a well known 
fact that the operation as it is generally practiced is the means 
of producing very frequently a much more serious condition 
than the one for which the operation had originally been per¬ 
formed. This new method has practically overcome the liability 
to collapse of the tracheal rings and stenosis of the trachea as 
well as many other complications resulting from the older 
methods of operating. 
The field for the operation should be prepared with a view 
to absolute (or as nearly as possible) asepsis, and a free incision 
made (longitudinally) about one and a half inches long, expos¬ 
ing two tracheal rings. Care must, however, be taken so that 
the cartilage is not injured. An incision is then made through 
the inter-tracheal ligament (transversely), and this opening need 
only be sufficieut to accommodate the tube. The opening is 
now dilated with the finger and thumb and the tube, which is 
supplied with a projecting lip at its lower end, readily drops into 
position. In the larger truck horses it will be necessary to use 
a larger tube than is used for the coach horse or thoroughbred, 
as the accompanying diagram will show. 
A 
TUBE (LATERAL VIEW). (FRONT VIEW.) 
TRACHEA SECTION. 
TRUCK HORSE— 
A to B, 2 inches. A to B, \ x / 2 inches. 
B to C, 4*4 inches. C to D, 2^ inches. 
AA Opening between tracheal 
rings through inter-tracheal 
ligament. 
COACH OR THOROUGHBRED— 
A to B, inches. A to B. 3 l 4 inches. 
B to C, 4 inches. C to D, 2*4 inches. 
I, Elliptical tube, size for Truck horse, inches. 
“ Coach or Thoroughbred fixji inches. 
