EXPERIMENTS AND PRACTICAL WORK 



35 



m 2 



Fig. 13. Rootstock, or Rhizome, of Iris 



Expt. 22. Cuttings in Water. Put two or three 

 cuttings of crotons in water and observe that roots 

 develop at the base. 



Exit. 23. Food does not 

 travel down a Stem if the 

 Cambium Layer is Injured. 

 Get three cuttings as in 

 the experiment above, but 

 remove a ring of bark about 

 2 in. wide and about 1 in. 

 from the base. Scrape the 

 exposed portion roughly and 

 place in water. Observe 

 that in the case of these cut- 

 tings the roots arise above 

 the ring, showing that the 

 ring prevented the carriage 

 of food to the lower portion in s leaves ; st > steni '> s > brown stale 



... L leaves; K, roots. (Stem 2 will be- 



01 the Cutting. come next year's corm.) 



Fig. 14 Longitudinal Section of 

 Conn of Crocus 



L, Leaves; F, flower; sh, sheath- 



