﻿OS TERHOU T— PERMEABILITY 



of 750 ohms in sea water was transferred to a mix- 

 ture consisting of 990CC. sea water-f-iocc. ether-f 5cc. sea water 



TABLE I 



Electrical resistance of Laminaria saccharina 



concentrated by evaporation until its conductivity was about 

 double that of ordinary sea water. This mixture contained approxi- 

 mately 1 per cent by volume of 

 e the r ( = o . 099 M) and had the same 

 conductivity as ordinary sea water. 

 In 10 minutes the resistance had 

 risen to 850 ohms; in 10 minutes 

 more it had fallen to 870 ohms. 

 It continued to fall until it reached 

 740 ohms, after which it fell very 

 slowly, at about the same rate as 

 the control. The fact that it fell 

 10 ohms below the starting point is 

 not necessarily to be attributed to 

 any injury, but rather to the fact 

 that the evaporation of the ether 

 increases the conductivity of the 

 sea water which is contained in v * " " M " % "~" 



the apparatus, and in the interstices between the protoplasmic 

 masses. The results are shown in table I and fig. 1. 



s The new resistance is the total resistance minus the resistance of the apparatus; 

 it is therefore the resistance of the tissue taken by itself. The resistance- Lriw n in 



permeability ( 



the influence of ether (0.099 M 

 water = 1 per cent by volume) : 

 )lution was not renewed (the 

 of renewing the solution is seen 

 2); the dotted line shows the 



