628 General Notes. [June, 
B. Vesuvian Celloidin Injection—1. Make a saturated solution 
of Vesuvian in absolute alcohol. 
2. Dissolve in this pieces of celloidin until the desired consist- 
ency is reached. The brown injection thus obtained is less satis- 
factory than that formed from asphalt, as its color fades some- 
what. 
C. Opaque Celloidin Injections —1. Dissolve celloidin in abso- 
lute alcohol and ether in equal parts. 
2. Add vermilion or Prussian blue to color. 
The coloring substance should be mixed with a small quantity 
of absolute alcohol and then reduced to great fineness by con- 
tinued trituration in a mortar. To the thick paste-like mass thus 
obtained the solution of celloidin is next added. The amount of 
coloring substance should be as little as possible, as the mass will 
otherwise be too brittle. If a fine injection is required the mass 
should be filtered through flannel moistened with ether. The 
syringe employed must be entirely free from fatty substances, as 
these render the injection mass brittle. If the piston does not fit 
the syringe tube sufficiently closely, it may be wound with a lit- 
tle gauze. The cannula should be filled with ether before it is in- 
serted and tied in place, and again filled just before it is joined 
to the syringe. 
In using a mass dissolved in alcohol ‘and ether it is well to 
the tissues. After injection the syringe and cannula should be 
cleansed with ether, ~ 
e injected organ is placed in hydrochloric acid, diluted more 
or less according to the danger of shrinkage. It is left in the 
acid, which is occasionally renewed, until the tissues are suffi- 
ciently corroded to be easily washed away by a slow and steady 
stream of water, conducted through rubber tubing connected with 
a water-pipe. The preparation may then be left in water for some 
days or weeks in order to free it from remaining fragments of 
tissue by gradual maceration. The preparation when finished, may 
be preserved either in glycerine or a mixture of glycerine, alcohol 
and water in equal parts. 
The asphalt-celloidin mass is the one most highly recommended 
by Schiefferdecker.— C. O. Whitman. 
_ Nors ON SEcTION CutTinc.—My only apology for the present 
communication is the hope that it may prove a saving of time to 
those who have encountered the difficulties of cutting eggs which 
are composed largely of yolk corpuscles liable to crumble in 
the ordinary paraffine method. The difficulty I have experi- 
~ enced lies not alone in the impossiblity of making sections—even 
_ from eggs very thoroughly permeated by the paraffine—which 
NG. 
