722 Plaster of Paris as an Injecting Mass. | November, 
son out of a small glass tube, as shown in Fig. I. The fine can- 
ula is connected with the canula of the syringe by means of a 
tightly-fitting rubber tube, Fig. II, 2. 
Uc ULLAL CA a RRR 
SSS : 
EXPLANATION OF THE DIAGRAMS. 
Fic. I.—1-2, a glass tube 6 mm. in diameter is evenly heated in the center over 
an alcohol or Bunsen flame, and drawn out till it is only 1-2 mm. in diameter. 
scratch is then made with a fine file and the two are broken apart. 
Fic. II.—1, the large canula of the syringe; 2, rubber tube serving to con 
nect this large canula to the fine canula, 3; 4, the oblique end of the fine canula, 
made by carefully grinding with a fine wet file. The sharp edges at both ends of the 
glass canula may be removed by cautiously heating in the flam 
Fic, I11.—The artery and vein of the left leg are exposed, wid the artery is rep- 
resented as ready for injection. To inject the body it is simply necessary to change 
the direction of the canula. æ, femoral artery; 4, femoral v 
on the large end of the canula ; 2, insertion of the canula into the artery; 3, knot 
connecting the strings round the artery and the large end of the canula. 
All the knots shown in the figure should be hard knots like 3. 
In order to inject, the given vessel or duct is exposed and a 
longitudinal slit made in it. The fine canula connected to the 
rubber tube, Fig. III, is put into the vessel, and a string tied in a 
hard knot around the vessel so that it will press on the canula. 
One end of this string is then tied to another string coming from 
= the large end of the canula, Fig. III, 1. This prevents the 
~ canula from slipping out of the vessel. 
-After the canula has been tied into the vessel, the injecting 
nas is prepared. Let it be for the arterial system of a cat. 
> cc. of the finest plaster of Paris is put into a clean dish, and 
of a E: cent, ae solution of alcohol, eee a8 
