316 C. EYZAGUIRRE 



Problems related to inhibitory transmitters will not be treated in the present 

 paper since this subject is discussed elsewhere in this symposium. In addition, 

 an extensive survey on inhibitory transmitters is available (cf. Conference on 

 Inhibition in the Nervous System and Gamma-aminobutyric acid (GABA). 

 Pergamon Press, 1960). 



Note added in proof: Since this paper was written, P. Peterson (private communication) 

 has shown that nerve fibres, presumably inhibitory, may end on the soma of these cells, 

 as seen with the electronmicroscope. 



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