MISSOURI BOTANICAL GARDEN BULLETIN 11 



Dnggar, B. M. "Botany." Am. Year Book, 1920. 



Duggar, B. M. ' ' Hydrogen Ion Concentration and the Com- 

 position of Nutrient Solutions in Relation to the Growth of 

 Seed Plants." Ann. Mo. Bot. Card., 1920. 



Dnggar, B. M. "The Nutritive Value of the Pood Reserve 

 in Cotyledons." Ann. Mo. Bot. Gard., 1920. 



Duggar, B. M. "The Nutritive Value of the Pood Reserve 

 in Cotyledons/' Carnegie Inst., Washington, Year Book, 

 1920. 



Duggar, B. M. "Refinements in the Indicator Method of 

 Hydrogen Ion Determination." Carnegie Inst., Washington, 

 Year Book, 1920. 



Duggar, B. M. "Some Pactors in the Salt Requirements of 

 Plants." Carnegie Inst., Washington, Year Book, 1920. 



Duggar, B. M. "The Use of 'Insoluble' Salts in Balanced 

 Solutions for Seed Plants." Ann. Mo. Bot. Gard., 1920. 



Jensen, L. P. " Influence of Parks on Civilization and Con- 

 servation of Plant Life." Parks and Recreation, 1920. 



Jensen, L. P. " Public Parks as Bird Protectorates. ' ' Parks 

 and Recreation, 1920. 



Karrer, J. L. and R. W. Webb. "Titration Curves of Cer- 

 tain Liquid Culture Media." Ann. Mo. Bot. Gard., 1920. 



Zeller, S. M. "Humidity in Relation to Moisture Imbibi- 

 tion by Wood and to Spore Germination on Wood." Ann. 

 Mo. Bot. Gard., 1920. 



During the convocation week of the American Associa- 

 tion for the Advancement of Science and affiliated societies 

 held in Chicago, December 27-January 1, the following papers 

 were presented by members of the staff and graduate students: 



Armstrong, G. M. "Sulphur Nutrition of the Fungi, with 

 Special Reference to the Use of Thiosulphato in Relation to 

 Hydrogen Jon Concentration. ' ' 



Duggar. B. M. "The Use of 'Insoluble' Salts in Balanced 

 Solutions for Seed Plants." 



Karrcr, J. L. "The Effect of Hydrogen-Ion Concentration 

 Upon the Accumulation and Activation of Amylase Produced 

 by Certain Parasitic Fungi." 



Brief indications are given below of the nature and signifi- 

 cance of the scientific papers published in the Annals during 

 the calendar year. 



Allen, E. R. (Ann. Mo. Bot. Gard. 7:75-79), /in a study of 

 Azoiobacter chroococcum, shows that contrary to expectation 

 a declining metabolic activity is exhibited by this organism 

 in reference to carbohydrate consumption. Carbohydrate con- 

 sumption is not related to the rate of increase in cell num- 



