ANTAGONISM 



165 



130 PER CENT 



100 



HCi O 



FIG. 71. Antagonism curve of Laminaria agardhii in NaCl 0.52 M, in HCI 0.119 M, and in 

 mixtures of these. The ordinates represent net electrical resistance (expressed as per cent, of 

 the normal net resistance) ; the abscissae represent the molecular proportions in the mix- 

 tures. Thus NaCl 50, HCI 50 means a mixture of NaCl 0.52 M and HCI 0.119 M in such 

 proportions that 50% of the dissolved molecules is NaCl and 50% is HCI. Each curve repre- 

 sents a single experiment. All readings were taken at 18 C. or corrected to this temperature. 



A reading taken at the end of 18 hours showed that the 

 tissue was dead in all the solutions. The plants can be 

 kept alive much longer than this in mixtures of NaCl + 

 CaCl 2 ; it is also noteworthy that the degree of antagon- 



