ANTAGONISM 



177 



Using electrical conductivity as a criterion, Eaber 

 (1920) has found well marked antagonism between 



100 n 



I 



+-' 

 to 



o 



Fio. 78. — ^Antagonism curves showing the net electrical resistance of Laminaria agardhii 

 in 1.1 Af sodium acetate, in 0.36 M sodium sulfate, and in mixtures of both. Ordinstes repre- 

 sent resistance (expressed as per cent, of the original resistance in sea water which is taken 

 as 100%); abscisses represent volumetric pro^portions of the two salts. The dotted line 

 ■connecting the ends of each curve shows the' approximate additive effect; the vertical dis- 

 tance of the curve above this dotted line may be regarded as a measure of antagonism. 



; 

 Na-acetate and NajSOi in experiments on Laminaria, as 



shown in Fig. 77. 



On placing tissue in the pure acetate we observe that 



at the end of 1% hours, the resistance has fallen to about 



12 



