REPORT OF THE SECRETARY 137 



SUMMARY 



The end of the second year finds the research work of the division 

 well under way with preliminary results on phototropism, and on 

 carbon dioxide assimilation of wheat; algae experiments on light 

 adaptation have been initiated; promising experimental work has 

 been begun in cooperation with the Department of Agriculture; and 

 spectroscopic measurements have been completed in both the ultra- 

 violet and infra-red. The laboratory space has been extended and 

 equipped for the expansion of the work. Shop facilities have been 

 added to care for the apparatus development. Essential additions 

 have been made to the division personnel in both the physiological 

 and physical sides of the project. 



Respectfully submitted. 



F. S. Bracketi', Chief. 



Dr. C. G. Abbot, 



Sec7'etary, Smithsonian Institution. 



