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Volume VI 



Number 1 



Annals 



of the 



Missouri Botanical 



Garden 



» 



s 



Contents 



February, 1919 



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Some Conditions Affecting the Growth and Activities of Azotobacter 



chroococcum E. R. Allen 1-44 



An All-Glass Nitrogen Apparatus E. R. Allen and B. S. Davisson 45-48 



Arcangeliella, Gymnomyces, and Macowanites in North America 



S. M. Zeller and C. W. Dodge 49-59 



The Use of the Colorimeter in the Indicator Method of H Ion De- 

 termination with Biological Fluids 



B. M. Duggar and C, W. Dodge 61-70 



Tyrosin in the Fungi : Chemistry and Methods of Studying the Tyro- 



sinase 



Reaction C. W. Dodge 71-92 



BOARD OF TRUSTEES OF THE MISSOURI 



BOTANICAL GARDEN, ST. LOUIS, MISSOURI 



Entered as second-class matter at the Post Office at St. Jxmis, Missouri 



Act of March 3, 1879 



