648 CATALASE ACTION 



200 mg. of hydrochinon + 3 cc. of H2O2 give a feeble red color. 

 200 " " " + 0.4 cc. of 0.1 N Na2C03 give a yellow color, 



200 " " " +3 cc. of H2O2 + 0.4 cc. of Na2C03 give a strong 



orange color. 



Addition of plant juice has no apparent effect. Similar results 

 were obtained v^ith paraphenylendiamine, pyrocatechine, and resin 

 of guaiacol. 



In connection with this fact we may mention the work of Welter 

 on the peroxidase of tea. Welter found that sand (sea sand of Merck, 

 purified) + H2O2 gave a peroxidase reaction with ring compounds. 



SUMMARY. 



Ulva tmniata contains oxidase. The existence of peroxidase is 

 not proved. 



We wish to express our gratitude to Dr. Walter Fisher, Director 

 of Hopkins Marine Station of Stanford University, for his hospitality 

 and valuable help, and to Dr. N. Gardner, of the University of Cali- 

 fornia, for determination of the material with which we worked. 



BIBLIOGRAPHY. 



Atkins, W. R. G., Sc. Proc. Roy. Soc. Dublin, 1915, xiv, 317. 



Baas-Becking, L. G. M., and Hampton, H. C, Am. J. Bot., 1920, in press. 



Bredig, G., and von Berneck, R. M., Z. physik. Chetn., 1899, xxxi, 258. 



Duclaux, H., Traite de Microbiologic, Paris, 1899, ii, 142. 



Duggar, B. M., and Davis, A. R., Science, 1914, xxxix, 260. 



Harvey, E. N., Am. J. Physiol., 1916, xli, 4, 454. 



Herzog, R. O., in Oppenheimer, C., Die Fermente und ihre Wirkungen, Leipsic, 



3rd edition, 1910, 265. 

 Issajew, W., Z. physiol. Chem., 1904, xlii, 132. 

 Jacobson, J., Z. physiol. Chem., 1892, xvi, 340. 



Loeb, J., Die chemische Entwicklungserregung des tierischen Eies, Berlin, 1909. 

 Lyon, E. P., Am. J. Physiol., 1909-10, xxv, 199. 



Maercker, M., Handbuch der Spiritusfabrikation, Berlin, 8th edition, 1903, 56. 

 Pickering, quoted in Lincoln, A., Textbook of physical chemistry. New York, 



1918, 368. 

 Reed, G. B., Bot. Gaz., 1915, lix, 407. 

 Senter, G., Z. physik. Chem., 1905, li, 673. 



