iqiq] 



HAAS—RESPIRA TION 



395 



tive respiratory rate and amount than does 2 per cent alcohol 

 (curve E). Unlike the 2 per cent alcohol, the maximum increase 

 is maintained during the second period. The rate becomes less 

 during the third period, after which it becomes quite constant. 

 The curves for 10 per cent alcohol (figs. 4a [C] and 46 [C] ; table IV C) 

 reach their maximum during the first period. Approximately the 



KEL.RATEOFRESP. 

 6 



ac 



90 



180 MIN17TES 



Fig. 46. — Curves (unbroken lines) showing efifect upon relative rate of respiration 

 of Laminaria of sea water containing A, 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; E, 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, e.xcept that D' serves 

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



same rate of respiration is maintained for 3 periods, after which the 

 increased rate rapidly becomes smaller. The relative amount of 

 respiration remains approximately constant for 4 periods and then 

 falls off very gradually. With 16 . i per cent alcohol (figs. 4a [B] and 

 46 [B]; table IV B) the maximum rate is not reached until the 

 second period, after which the decline is more rapid than that for 

 any of the lower concentrations. It will be seen that at the end of 



