42 



THE PHYSIOLOGY OF INSECT SENSES 



150 



50 92 100 



Resistance (arbitrary units) 



Fig. 32. Graph obtained from the model in Fig. 3 IE showing the relation 

 between the angle of the applied compression force and the resistance 

 of the electrolytic cell for various values of the compression force. 

 (Redrawn from Pringle, 1938 b.) 



to be lengthened in one direction and shortened in another. As a result 

 of this action, the paper strip humps up in the middle. If the end of the 

 neuron is imagined as being inserted on the underside of the middle of 

 the strip it will be stretched by movement in one direction and com- 

 pressed by that in the other. The magnification of movement is very 

 large. 

 In order to provide some measurement of the force involved, 



