PLATE XXII. 



Fm. 



1. Gheiranthus Cheiri (Wallflower). Showing changes 



in the production of three to four cotyledons (see 

 text for description). (Original.) pp. 215-216. 



2. Buddleia Hemsleyana. Shoot showing incomplete 



change from the normal opposite-decussate phyllo- 

 taxis to the whorled and scattered arrangement 

 (diagrammatic). (Original), pp. 217-218. 



3. Cyclamen per sicum (Sow-bread). Adventitious leaves 



on hypocotyl; apex of seedling excised. (After 

 G-oebel.) p. 244. 



4. Marrubium vulgare (Horehound). Terminal double- 



leaf formed by union of leaves of uppermost pair. 

 (Original.) p. 226. 



5. Phlox paniculata. Laminar enations from upper 



surface. (Original.) p. 201. 



6. Antirrhinum majns (Snapdragon). Three seedlings 



(a, b, and c) each showing a distinct form of terminal 

 double-leaf. (After De Vries.) pp. 225-226. 



