ANTAGONISM 



177 



Using electrical conductivity as a criterion, Raber 

 (1920) has found well marked antagonism between 



lOO-i 



(0 



O 



Acetate 100 

 Sulfate 



FIG. 78. Antagonism curves showing the net electrical resistance of Laminaria agardhii 

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

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

 as 100%); abscissae represent volumetric proportions 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 Na 2 S0 4 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 



