224 BONY FISHES vn. 20- 



produces movements of the stomach but not of the intestine; the 

 latter, however, shows movements when the splanchnic nerve is 

 stimulated. In most of the viscera acetyl choline causes initiation of 



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Fig. 141. Tracing of contractions of the muscle of the urinary bladder of Lopliius, 



attached to a lever. At A, D, and F faradic stimulation of vesicular nerve. Drugs added 



to make, at b acetyl choline 1/2,000,000; at c adrenaline 1/500,000; at E ergotoxine 



1/50,000. Time, minutes. (From Young.) 



Fig. 142. Tracing to show effect of atropine 1/50,000 added at A, on the contractions 



of the bladder of Lophius produced by faradic stimulation of the vesicular sympathetic 



nerve. Time, minutes. (From Young.) 



rhythmic contractions and these are inhibited by adrenaline (Figs. 

 140 and 141). In Lophius this is true of the stomach, with motor-fibres 

 from the vagus, intestine, with sympathetic motor-fibres, and of the 

 muscles of the bladder, which contract on stimulation of the hinder 

 sympathetic ganglia. However, in the trout adrenaline causes contrac- 

 tion of the stomach (Burnstock, 1958). The effect of the nerves to the 



