The tendency is to overinject a case. One must not forget that the
tissues will probably thicken to twice the size of the mass injected.
The operator must estimate as nearly as possible the size of the tract
to be filled and then aim to throw in enough to about half fill it.
The diffusion of the paraffin will usually safely hold the hernia when
the patient rises from the table.
Should the operator throw in mixtures one and two until the parts are
fairly distended and the hernia be not held it is better to use only
the plain sterile vaseline for a subsequent injection at the site of
the internal ring. If a half dram of vaseline at this point does not
hold the hernia a small amount of vaseline may then be thrown in the
central portion of the canal.
At first the vaseline injections should be used whenever in doubt as
to the amount needed above a certain point. As the operator becomes
acquainted with the needs of cases by experience the vaseline can be
largely substituted by the paraffin mixture number one.