1915] OSTERHOUT—PERMEABILITY 469 
A lot of tissue which had in sea water a resistance of 840 ohms 
was placed in sea water to which Ce,(NO,)6-12 H.O had been 
added (0.8 gm. to 300 cc. of sea water, making the concentration 
0.003 M). In the course of 30 minutes the resistance rose to 970 
ohms; during the next hour it continued to rise, reaching a maxi- 
mum of 990 ohms, after which it slowly fell. The results are given 
in table III and fig. 3. 
TABLE IV 
ELECTRICAL RESISTANCE OF Laminaria saccharina 
7 pea water 
Time in hours NNO 6 H.O In sea water 
8 gm. (=0,007 M) 
PO eccrine eh ee 740 770 
pe eee ih ee ae ee a emits.” een ae ee ot ae as Se a eee 
All readings were taken at 18°C. 
[@) 
ri 
ae 
mM 
e. 
sa 
i re 5 10 20 HOURS 
f el i f Laminaria water €r 300 Cc. 
loaecn -12 H,O o. “at = (0.007 “ (unbroken a and of a control in sea 
water (dotted line). 
