“Choline esters (acetylcholine, methacholine, propionylcholine and butyrylcholine), anticholinesterases (eserine and neostigmine), ganglionic stimulant agents (nicotine and dimethylphenylpiperazinium) and polypeptides (angiotensin, eledoisin and bradykinin) acting from the serosal surface, antagonized the peristaltic block caused by magnesium added to the organ bath.”