SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 107, NO. 17, PL. 2 



Susceptibility of Oat Seedlings to Emanation from Wood as 

 Influenced by age at Exposure 



I, 2, 3, controls, aged 5, 6, and 7 days, respectively; 4, age 5 days, exposed to 

 wood from time of planting ; 5, age 6 days, exposed to wood after first 24 hours ; 

 6, age 7 days, exposed to wood after first 48 hours. 



