644 



CATALASE ACTION 



So we see that the formula of Schmidt-Nielsen is valid for the 

 case of excess carbonate. 



Unneutralized peroxide was harmful, as the following experiment 

 shows. 



3 gtn. of Ulva + 3 cc. of unneutralized H2O2 and 15 cc. of distilled water. 



The summary of this experiment is given in Fig. 4. The point 0, 

 in the figure, "neutral to phenolphthalein," seems to be the optimum 

 point for catalase. (For similar lines see Bredig and von Berneck 

 and Jacobson's work.) 



As described above, the water in which undamaged plants remained 

 for a certain time contained catalase. This catalase did not follow 

 the logarithmic curve. 



