INFLUENCE OF EXTERNAL CONDITIONS ON GROWTH 269 



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Fig. 122. — Two branches of broom, Genista anglica. C, 

 grown in dry air; B, in moist air. 



Fig. 121. — Leaves of Tarax- 

 acum. A, grown in very moist 

 atmosphere (actual length about 

 60 cm.). ß and ß', grown under 

 usual conditions (actual lengths 

 about 15 and 12 cm., respectively). 



Fig. 123 



4*£ 



1 ш 



-Sempervivum. I, normal; II, grown in moist 

 air; III, grown in darkness. 



