SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 94, NUMBER 15 



AERIAL FERTILIZATION OF WHEAT 

 PLANTS WITH CARBON-DIOXIDE GAS 



(With Six Plates) 



BY 

 EARL S. JOHNSTON 



Division of Radiation and Organisms, 

 Smithsonian Institution 



(Publication 3346) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



DECEMBER 20, 1935 



