470 
BOTANICAL GAZETTE [JUNE 
A similar experiment was performed by adding 0.8 gm. Y(NO;); 
6 H.O to 300cc. of sea water (=0.007 M) and placing a lot 
TABLE V 
ELECTRICAL RESISTANCE OF Laminaria saccharina 
n sea water gly ce. 
Time in hours | pains 43 I In sea water 
=0.00 M) 
Ce sae 750 730 
OS ae as en a COU BREED EA a kertrey oop ana 
pe ann Mie re sae TO HOO. ne ee eee cae 
Sy Ae rere rarer eo 500 670 
All readings were taken at 18° C 
850_OHMS 
Bis — 
fe ae 
~~ ae a 
ee 
= a Me < 
650. 
x. 
r ~ 
i 2 5 10 HOURS 
f Laminaria saccharina in sea water 
1G. 5.—Curve of electrical resistance 
Fig. x. 
tooo cc.+Fe,(SO,); (=0.0025 M) (unbroken line), and of a control in sea water 
(dotted line). 
of tissue in this mixture.s 
The tissue had in sea water a resistance 
of 740 ohms; after being transferred to sea water+Y(NO,); the 
were equal, a molecule of Y;(NOs)s 
ould be noted that if the 
5It sh dissociatio 
would yield only half as many kations as a atari of La,(NO,)¢ or of Ce.(NO})6- 
