I9I9] 



HAAS— RES P IRA TIOX 



387 



In fig. 16 (A) it will be seen that in sea water containing ethyl 

 bromide the relative rate of respiration is greatly increased during 

 the first 2 periods and then drops to the normal rate in about 90 

 min. After 132 min. no excretion of CO^ could be detected. When 

 we plot the curve B (fig. ib), in which the ordinates represent the 

 relative amount of respiration, we find that the curve is far above 

 the base line even when the respiration cannot be detected. 



REL. RATEOFRESP. 

 REL. AMT.OFRESP 



MINUTES 



Fig. 16. — Cunes showing effect of sea water approximately saturated with ethyl 

 bromide upon A, relative rate of respiration; B, relative amount of respiration of 

 Laminaria (unbroken lines j; controls in sea water (broken linesj; see table I F; each 

 control bears the same letter (with a prime; as the experimental curve. 



The fact that ethyl bromide appears to have a marked accelerat- 

 ing effect upon the respiration confirms the results of Applemax d), 

 who obsers'ed that when potato tubers are exposed to ethyl bromide 

 vapor the respiration is greatly increased. Fig. ib makes it 

 evident that there is no initial decrease in the respiration. 



The ethyl bromide referred to in table I F was acid, and since 

 it was not neutralized by adding sodium carbonate it caused the 

 PH of the sea water plus anesthetic to be lower than that of the 

 sea water alone. In experiments with all other substances both 

 sea water and sea water plus anesthetic were of the same PH value 

 at the beginning of the experiment. 



