190 H. T. ANDERSEN, M. FUNAKOSHI AND Y. ZOTTERMAN 



in the recordings obtained from the type III fibre. Two figures are fur- 

 nished in order to illustrate this phenomenon. In Fig 14A the response to 

 sucrose after a water rinsing is seen to be a conspicuous burst of spikes, and a 



Fig. 13. Responses recorded from a single " salt-sugar "" fibre (type II) upon 

 application of 0.5 m mixture after 0.5 m sucrose (A) and 0.5 m sodium chloride (B). 



Time in seconds. 



Fig. 14. Responses recorded from a single fibre of type III. Note the response 

 to 0.5 M sucrose is depressed by previous 0.5 m sodium chloride. Time in seconds. 



Sucrose Mixture 



A 



NaCl Mixture 



B 



A 



Fig. 15. Records from a single fibre of type III showing the depressing effect 

 of sodium chloride on the response to mixture. Time in seconds. 



similar response is ehcited from the fibre when stimulated with sodium 

 chloride (Fig. 14B). However, when sucrose followed after an application 

 of 0.5 M NaCl without intermediate rinse with water the response to the 

 sugar was very much less than before. Again, in Fig 15A it is shown that 

 the electrical activity in a type III fibre to the mixture was very marked 

 when the tongue had been flushed with 0.5 m sucrose solution just before, 

 whereas treatment with sodium chloride prior to the application of the 

 mixture nearly abolished the response from the fibre. 



