316 BOTANICAL GAZETTE [OCTOBER 
hours after the beginning of the experiment, and shows that the 
tissue, which had only partially recovered its normal permeability, 
TABLE IV 
PROGRESSIVE CHANGES IN PERMEABILITY OF TISSUE OF LIVING Laminaria; EXPRESSED 
RATE OF CHANGE OF CONDUCTIVITY OF SOLUTION IN 
UPPER CELL, IN PERCENTAGE PER HOUR 
bar gating enor ema UPPER SOLUTION, NACL, 0.26 M;|| Upper SOLUTION, CACIs, 0.14 M; 
SEA WATER : LOWER SOLUTION, NACL, 0.52 M || LOWER SOLUTION, CACL:, 0.28 M 
D Rate Dura- | Rate Dura- | Rate 
tion of |/Period begun at} _ tio of 
in min. ange in mi 
ee ch a Pi smc ictondces tm Sige change 
6:45 A.M..| 120 | 0.67 || 2:40 P.M...,) 120] 1.21 || 9233 A.M....| 122 | 0-§1 
Q:15A.M..| 124 | 0.78 || 5:10P.M...| 150 | 2.30 |l12:05 P.M....| 124 | 0.82 
II:45A.M..| 22r | 1.02 || 8:15 130 | 2.50 || 2:45 P.M.. 121 | 0.69 
Siew eee | eee ee ea ec as ek 5:25 P.M.. 120.) 137 
me Mal S70 | OBE er eo he pans 8:10 P.M.. 135 | 2-95 
He We ke ee es | ae eo Oe at ee Ge, hi Se eh be cet 
oeerlererre 
ee ee ee 
1 2 3 + 6 ry Ss 2 Hours. 
suffered no further injury during the period of low temperature 
(o-4° C.) intervening between the fifteenth and twenty-fourth 
