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ERNST FLOREY AND GRAHAM HOYLE 



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Fig. 3. Cancer magister, intracellular record of potential changes induced by 

 hyperpolarizing (1 and 3) and depolarizing square pulses (2 and 4) without 

 ( 1 and 2) and during (3 and 4) stimulation of the inhibitory axon at 1 20 pulses/sec. 

 Upper channel records membrane potential, lower channel monitors the applied 

 pulse. Voltage calibration 10 mV. Note the absence of marked permeability 

 change, and the extent of rectification. 



^ 



Fig. 4. Cancer magister. closer muscle of walking leg. Intracellular record (upper 

 channel) of potential change induced by application of hyperpolarizing square 

 pulse (monitored on lower channel), (a) Normal fiber, (b) fiber treated with 

 picrotoxin 10"^ g/ml. Voltage calibration 10 mV. Note slight increase in membrane 



resistance, 



