1915] OSTERHOUT—PERMEABILITY 325 
Table VII and fig. 7 show the behavior of tissue in sea water 
to which sufficient FeSO, +7H.O had been added to make the 
concentration 0.005M (1.39 gm. to rooocc. sea water). Some 
precipitate formed after standing. 
TABLE VII 
ELECTRICAL RESISTANCE OF Laminaria saccharina 
ane In sea water 1000 cc. 
Time in hours (FeSO,+7H,0) 1.39gm. In sea water 
(=0.005 M) 
| 
| 
| 
| 
| 
° gio 890 
qe Iroo a aebe 
4 1040 a 
i: 000 oe 
24 970 oe 
18 750 780 
40 450 730 
All readings were taken at 18°C. 
1100 OHMS 
5 10 20 30 HOURS 
Fic. 7.—C f electrical resist h ter 1000 cc. 
+(FeSO,+-7H.0) 1 .39 gm (=0.005 M) (unbroken line) and of a control in sea water 
(dotted line). 
