394 



BOTANICAL GAZETTE 



[mav 



In view of the fact that alcohol is considered to be formed dur- 

 ing respiration, it was deertied important to study the effect of 

 varying concentrations of alcohol upon the rate of respiration. 

 When sea water contains i per cent of Squibb 's absolute alcohol 

 (figs. 4(2 [F] and 46 [F]; table IV F), the respiratory rate remains 

 normal for 3 periods, after which there is a gradual decline to below 



REL.AMT.OF RESP. 

 6 



4JI^j j j^rg:5z:rg^::zpc 



90 



180 



MINUTES 



Fig. 4a. — Curves (unbroken lines) showing effect upon relative amount of respira- 

 tion of Laminaria of sea water containing ^, 24. 2 per cent ethyl alcohol; B, 16. i per 

 cent ethyl alcohol; C, 10 per cent ethyl alcohol; D, 5 per cent ethyl alcohol; £, 2 per 

 cent ethyl alcohol; F, i per cent ethyl alcohol; controls in sea water (broken lines); 

 each control bears same letter (with prime) as the experimental curve, except that 

 D' serves as control for curves D, E, and F; see tables IV A to IV F. 



the normal rate, whereas the relative amount of respiration remains 

 nearly constant. The curves for sea water containing 2 per cent 

 alcohol (figs. 4a [E] and 4b [E] ; table IV E) show a slight increase in 

 the relative rate during the first period, followed by a smaller 

 increase for the second period, after which there is a decline below 

 the normal. As would be expected, 5 per cent alcohol (figs. 4a [D] 

 and 46 [D]; table IV D) gives a much greater increase in the rela- 



