INTRODUCTION. 
ounces, serves very well for injection. 
correct size may be had by asking the 
filling cannula of the Parke Davis serum 
syringe. The end to be inserted into 
the blood-vessel should be ground off 
obliquely and smoothly on a whetstone. 
The connection between the cannula and 
nozzle is formed by stiff rubber tubing 
which should be securely tied to the can- 
nula (Fig. 2). 
The injecting mass is prepared by 
thoroughly mixing 100 c.c. of water, 20 
c.c. of glycerin, 20 c.c. of concentrated 
formalin, and 85 gm. of common laun- 
dry starch. One-half should be colored 
red by adding to it one or two grams of 
powdered carmin made into a paste with 
a few drops of ammonia, and the other 
colored blue by dissolving in it a gram 
or two of soluble Berlin blue. These 
liquid masses, after being passed through 
a fine wire strainer or a coarse piece of 
cheese-cloth stretched across a funnel, 
may be preserved for any length of time 
in covered jars. 
The animal may be anesthetized by 
placing it in a tight box with a cloth or 
absorbent cotton wet with 30 cc. of 
ether or chloroform. If only the ar- 
teries are to be injected, the cat may 
remain in the box until dead; but if the 
5 
A cannula of 
druggist for the 
Fic. 2, INJECTING 
SyRInGE. X é. 
Pp, Plunger handle; 
b, barrel ; $i, 
nozzle; c, can- 
nula; yr, rubber 
tube; dt, point 
of detachment ; 
s, string. 
veins are also to be injected, it is preferable to use ether for 
the anesthetic and then remove the animal to the tray as 
soon as it is unconscious, and reflect a portion of skin, ex- 
