CARPOTROPIC MOVEMENTS OF AQUATICS 307 



and curvatures of petioles of some species are examples of this 

 action. 



392, Carpotropic and Gamotropic Movements of Peduncles and 

 Other Organs, Cultivate a number of individuals of any species 

 of Fragaria, or any member of the poppy family and note the 

 positions assumed by the flower bud, open flower and developing 

 fruit. Determine position of motor zone producing movement. 



A B CD 



FIG. 144. Carpotropic movements of A Ilium Neapolitanum. D, inflorescence 

 emerging from bracts, in which stage the scape is curved with its apex directed down- 

 ward. C, the scape is straightening, and one of the pedicels, which has emerged from 

 the bracts, is seen to be apogeotropic. B, flowers all open, with pedicels in positions 

 assumed in response to growth or correlation stimuli, which is further modified in the 

 final position in A. 



Follow the movements and positions of the calyx. Make similar 

 observations on Tradescantia or Hippeastrum. Use the clinostat 

 and dark room and determine to what forces each movement 

 owes its stimulus (131). 



393. Carpotropic Movements of Aquatics. Follow the move- 

 ments of the scapes of Pontederia, Vallisneria, or of almost any 

 aquatic plant and note the positions assumed. 1 



1 Hansgirg, A. H. Physiologische und Phycophytologische Untersuchungen. 1893. 



Hansgirg, A. Neue Untersuchungen ueber den Gamo- und Karpotropismus, sowie 



ueber die Reiz- und Schlaf bewegungen der Bliithen und Laubblatter. Prague. 1896. 



Hansgirg, A. Bertrage zur Kenntniss der Bluthenombrophobie. Prague. 1896. 



