THE MICROTOMIST 'S VADE-MECUM

and then preserved for use.     Before injecting add I to -
benzol, and filter. Chloroform and turpentine may also be
used as solvents.   Used for injecting the juice-canals of
cartilage by the method described 1. c., or by puncture.
441. Celloidin Injection-mass (Schiefferdecker's formule 1).
-1. Asphalt-celloidin is the best of these injections.     To
prepare it-
Pulverise asphalt in a mortar, and put it for twenty-
four hours into a well-closed vessel with some ether, shaking
occasionally. After the twenty-four hours pour off the ether
into another vessel, and dissolve in it small pieces of celloidin
until the solution is of the consistency of one of the thicker
fatty oils. (The undissolved asphalt may be employed for
colouring a fresh quantity of ether, in which substance it is
not very soluble.)
442. Vesuvianin Celloidin Brown Injection.2-2. Make a
concentrated solution of Vesuvianin in absolute alcohol and
dissolve celloidin in it. (This colour is not fast.)
443. Opaque-Blue Celloidin Injection.3-3. Dissolve cel-
loidin in equal parts of absolute alcohol and ether, and add
pulverised Berlin-blue.
444. Opaque-Red Celloidin Injection.4-4. Proceed as above
(3), taking pulverised cinnabar instead of Berlin-blue. The
two last pigments should be rubbed up in a mortar with a
little absolute alcohol and the paste added to the celloidin-
mass. Be careful not to take more pigment than is abso-
lutely necessary, or the injection will become brittle. To
filter (if this be thought necessary), strain the mass through
flannel wetted with ether.     Syringes must be free from
grease, which would render the mass brittle. The nozzles to
be filled with ether. Inject quickly, as the mass soon sets on
contact with watery tissues. Clean syringes and nozzles with
ether.
I ' Arch. Anat. u. Phys.,' 1882 (Anat. abtb.), p. 201.
2 Ibid.        3 Ibid.         4 Ibid.

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