196 



H. DIAMANT AND OTHERS 



NaCl in solutions from 0.001 to 1.0 m. When the peak amplitudes of the 

 integrated responses were plotted against the logarithm of the molarity we 

 obtained in all six cases a fairly straight curve up to 0.2 m NaCl solution. 



0.01 



1 M NaC\ 



Fig. 2. Graphs showing the relation between peak height of electrical response 

 and the molarity of the NaCl solution applied to the tongue. 



I (— I 1 j 1 1 1 



0.02 0.05 0.1 0.2 0.5 1 M Sucrose 



Fig. 3. Graph showing the relation between peak height of response and the 



molarity of the sucrose solution applied to the tongue. 



After this point the curve tends to level off (Fig. 2). The threshold seems 

 to be around 0.01 M NaCl which is in good accordance with the values 

 obtained in psychophysical experiments on man (v. Skramlik, 1926). 



