350 



BOTANICAL GAZETTE 



[april 



sea water containing anesthetic and the respiration determined 



after successive equal periods until death ensued, and for some 



time thereafter. 



TABLE I 



Control for I A: 7 periods (27.5 min. each) in sea water; solution 



RENEWED AT BEGINNING OF EACH PERIOD 



Change in PH value of sea water produced by respiration of Laminaria during 2 



PERIODS (22 MIN. each) IN SEA WATER AND DURING 7 SUBSEQUENT PERIODS 

 IN SEA WATER APPROXIMATELY SATURATED WITH ETHYL BROMIDE 



* Approximate (at this point indicator is not very sensitive to slight changes in acidity). 



As it was important to know the time of death as accurately 

 as possible, determinations of the electrical conductivity of the 

 tissue were made by the method of Osterhout (12, 13). If the 



