“…Paton (1955) showed that twitches induced by electrical stimulation were insensitive to hexamethonium. However, Hartfelder, Kuschinsky & Mosler (1958) reported that hexamethonium depresses the responses of the ileum to electrical stimulation. We confirmed the results of Paton and found that the potentiating effect of tolazoline (2-20 ttg/ml.)…”