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278 OPERATIVE DENTISTRY
is relatively non-toxic. It is particularly non-irritating even on
the most delicate tissues. It is easily combined with suprarenin,
and, so combined, does not loose its anesthesia producing power.
Neither does it affect the action of the suprarenin. It can be

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Fig. 147.—First position in the mandibular injection.

boiled for the purpose of completing sterilization. Novocain is a
non-habit producing drug, and, as claimed by the manufacturers,
is derived from an entirely different source than cocaine, to which
it is in no way related. The general effects upon the system af-
ter it has been absorbed are scarcely perceptible. Neither the cir-
culation nor the respiration suffers and the blood pressure is not