NEUROMUSCULAR MECHANISMS 157 



studied the effect of temperature on the mechanical effects of single and 

 double stimuli in the sea anemone Calliactis. At higher temperatures, 

 single impulses start to give visible contractions of the longitudinal mus- 

 cles, but at the same time the summation period for two impulses de- 

 creases considerably. From these results he draws further conclusions 

 regarding the processes of excitation and facilitation. 



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