ANTAGONISM 



143 



ment. The values of the velocity constants which are 

 thus obtained, are given in Table X. 



It is evident from Table X, that as the per cent, of 

 CaCla in the mixtures increases (beginning at 1.41% 

 CaCla) the value of Z"^ first falls and then rises, its 



laojjt 



25 



50 



75 HOURS 



PiQ. 60. — Curve of net electrical resistance of Laminaria agardhii in 95.24 NttCl + 4.76 

 CaCli (unbroken line) the trial curve (broken line) calculated from the velocity constants Ka 

 = .000245 and Kh=>=.00590. Each observed point represents the average of six or more 

 experiments: probable error of the mean less than 10% of the mean. AH readings were 

 made at 15° C. or corrected to this temperature. 



minimum value occurring in 97.56 NaCl + 2.44 CaCl2 

 (which is the mixture in which the tissue lives the long- 

 est.). It seems reasonable to assume that in each 

 mixture a substance is formed which reduces the value 

 of K^. We may assume that the decrease of .K^j^is directly 

 proportional to the amount of this substance, which may 

 be assumed to occur in maximum amount in 97.56 NaCl + 

 2.44 CaCls. 



The simplest assumption which we can make is that 

 NaCl and CaClg combine with some constituent of the 



