Experiment 15 — Darkroom. 



Note: Verbascum No. 1, normal. 



Verba.scum No. 2, hairs removed from upper leaf surfaces. 

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



Experiment 16 — Darkroom. 



Note: Verbascum No. 1, 

 Verbascum No. 2, 

 Verbascum No. 3, 



normal. 



hairs removed from upper leaf surfaces. 



hairs removed from lower leaf surfaces. 



83 



