W. J. V. OSTERHOUT 



407 



were added (all the solutions having the same conductivity as the 

 sea water and being approximately neutral to litmus). The temper- 

 ature was 18.5° ± 2.5°C. 



The results are shown in Fig. 2. There is a gradual fall of resist- 

 ance in all the solutions which continues until the death point (10 per 



100% 



50%- 



Fig. 2. Curves showing antagonism between NaCl and sodium taurocholate. 

 The ordinates represent the net electrical resistance of Laminar'ia (expressed as 

 per cent of the control in sea water which is taken as 100 per cent). The ab- 

 scissae represent the amount of sodium taurocholate added to 1,000 cc. of NaCl 

 0.52 M. Average of two experiments; probable error less than 5 per cent. 



cent) is reached. In the solution containing 1,000 cc. of NaCl 0.52 

 M + 0.5 gm. of sodium taurocholate the fall of resistance is much 

 slower, indicating that this is the most favorable mixture. 



It should be emphasized that the effect is not an intermediate but 

 an antagonistic one. By this is meant that the resistance is not 



