1915] OSTERHOUT—PERMEABILITY 467 
sea water. The results of such an experiment are shown in table I 
and fig. 2. To 275 cc. of sea water 5 gm. La,(NO,)5:12 H.O were 
TABLE II 
ELECTRICAL RESISTANCE OF Laminaria saccharina 
In sea water 275 cc. + 
Time in hours Laa(NO;)s-12 H.O In sea water 
5 gm. (=0.021 M) 
| 
i ca uiars | 1090 1080 
[2 Wo. ea Rear rao 1210 1080 
GIG coe ei ee, pd Cs tebe Pc nies Dhar meen fer pita 
Dees Oo eve tk a 1.0 eth Nwenting Dear diene igre Seer soot a 
RESUS pear og aie ARES 28) 2 PA Mek ar areen ened Sanita 
Ea Arena Rote toe 980 1030 
Ga oR RR RON RE 035 b €ovove) 
All readings were taken at 18° C. 
1220. OHMS 
1s 5 10 20HOURS 
G. 2 -—Curve of electrical resistance of Laminaria saccharina in sea water 
Fic. 
275 cc.+La.(NO,)6-12 H.O 5 gm. (=0.021 M) (unbroken line), and of a control in 
sea water (dotted line). 
added, making the concentration 0.021 M. In this the resistance 
of a lot of tissue rose rapidly from 1ogo to 1210 ohms, where it 
remained stationary for a time and then began to fall. In the course 
