1915] OSTERHOUT—PERMEABILITY 329 
Some precipitate formed on standing. The concentration 
used was 0.005M (1.13 gm. to 1000 Cc. sea water) 
TABLE XI 
ELECTRICAL RESISTANCE OF Laminaria saccharina 
In sea water 1000 cc. 
Time in hours (SnCl.+2H.0) 1.13 gm. In sea water 
(=0.005 M) 
780 75° 
: ° 
Wa /02 nol al 
Palin! 
“I 
wn 
° 
400 690 
320 530 
~I 
ft 
(eo) 
All readings were taken at 18°C. 
900 OHMS 
T T 
20 30 costae 
Fic. 11.—Curve of electrical resistance of Laminaria saccharina 
Tooo cc.+(SnCl,+2H.0) 1.13 gm. (=0.005 M) (unbroken line) and a a eats in 
Sea water (dotted line). 
It is evident that there is a remarkable difference between the 
chlorides of monovalent and the chlorides of bivalent kations in 
their effects on permeability. So far as the writer’s experiments 
have gone, none of the chlorides of monovalent kations are able to 
decrease permeability (with the significant exception of HCl), 
