Experiment 9 — Greenhouse. 



Note: Verbascum No. 1. normal. 



Verbascum No. 2, hairs removed from upper leaf surfaces. 

 Verbascum No. 3, hairs removed from lower leaf surfaces. 



Experiment 10 — Greenhouse. 



Note: Verbascum No. 1, normal. 



Verbascum No. 2. hairs removed from upper leaf surfaces. 

 Verbascum No. 3, hairs removed from lower leaf surfaces. 



SO 



