388 



BOTANICAL GAZETTE 



[may 



The respiration of Laminaria was followed for several hours, 

 when the tissue was placed in solutions of sea water containing 

 3.2 per cent (fig. 2a [A], fig. ih [A]; table II A) and 0.8 per cent 



REL.AMT.OFKESP. 



2 



B~~r~ ^~~~~-A- A £, 



60 



120 



MINUTES 



Fig. 2a. — Curves (unbroken lines) showing the effect upon the relative amount of 

 respiration of Laminaria of sea water containing A, 3.2 per cent formaldehyde; 

 £,0.8 per cent formaldehyde; C, 0.3 per cent chloroform; D, 0.05 per cent chloro- 

 form; controls in sea water (broken lines); see tables II A to II D; each control bears 

 the same letter (with a prime) as the experimental curve. 



REL.RATEOFRESP. 



^^^s^^:^.^^ 



60 



120 



MINUTES 



Fig. 26. — Curves (unbroken lines) showing effect upon relative rate of respiration 

 of Laminaria of sea water containing A, ^.2 per cent formaldehyde; B, 0.8 per cent 

 formaldehyde; C, 0.3 per cent chloroform; Z), 0.05 per cent chloroform; controls in 

 sea water (broken lines); each control bears the same letter (with a prime) as the 

 e.xperimental curve. 



