so Puget Sound Marine St. Pub. Vol. 1, No. 5 



Por suggestions in the work reported in this paper we are indebted to 

 Dr. T. C. Frj'^e, of the University of Washington and Director of the Puget 

 Sound Marine Station; and both to Dr. B. M. Duggar of the Missouri 

 Botanical Garden and Dr. Geo. B. Rigg of the University of Washington 

 for helpful suggestions in preparing the paper. 



In the division of labor the work of writing the paper fell to Mr. 

 Zeller, and both authors collected and determined gases. 



CITATIONS 



1. Blackman, F. F. Optima and Limiting Factors. Ann. Bot. 19:281- 

 295. 1905. 



2. Brown, H. T., and Escombe, F. On the Variations in the Amount of 

 Carbon Dioxid in the Air of Kew During 1898-1901. Proc. Roy. Soc. 

 London 76 B:118-121. 1905. 



'6. Coulter, Barnes and Cowles. Textbook of Botany. 2:pp. 554-555. Amer. 

 Book Co., Chicago. 1911. 



4. Hempel Walther. Methods of Gas Analysis. (Trans, by Dennis.) 

 Third edition. The Macmillan Co., N. Y. 1902. 



5. Lucas, A. H. S. The Gases Present in the Floats of Certain Marine 

 Algae. Proc. Linn. Soc. New-South- Wales 36:626-631. 1911. 



6. MacMillion, Conway. Observations on Nereocystis. Bull. Torr. Bot. 

 Club 26:273-296. 1899. 



7. Rosanoff, M. Serge. Observations sur les fonctions et les proprietes 

 des pigments de diverses algues suivies de quelques donnees rela- 

 tives a la structure des formations protoplasmatiques. Mem. Soc. Imp. 

 Sci. Nat. Cherbourg. 13:143-240. 1868. 



8. Willie, N. Ueber die Blasen der Fucaceen. Biologiska Forenings 

 Forhandlingar in Stockholm 1:63-65. 1889. (Just's Bot. Jahresber. 

 17:226. 1889.) 



