Abstract
The hemicholinium compound 4, 4′-biphenylylenebis[carbonylmethyl-(2-hydroxyethyl)dimethylammonium bromide] (HC-3) (Long and Schueler, 1954) has been shown to produce a neuromuscular block in rabbits which is of gradual onset, long duration (Reitzel and Long, 1959) and dependent on the frequency of nerve stimulation (Wilson and Long, 1959). An attempt has been made in the present study to determine the effect of HC-3 on neuromuscular transmission in the cat by using the tibialis anterior muscle-sciatic nerve preparation. Some effects on this preparation have already been described by Bowman and Rand (1961).

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