160 . SEVENTEENTH REPORT. 



and kept their vigor four to five days longer than either those under 

 the bell jars or in the case. The growth continued through the 

 first three days in all plants, but growth was noticed the fourth 

 day only in those in moving air. 



The result of these tests shows that moving air does affect the 

 groAvth of jdants; for the plants in the current lived longer than 

 those in still air. 



This is only a preliminary report. The writer is under great obli- 

 gations to Prof. F. C. Newcombe of the Botanical Department of 

 the University for most valuable assistance in carrying out the above 

 experimental investigations. A more complete report cannot be 

 given until more work has been done. 



University of Michigan, Ann Arbor, 1915, 



