THE FLOWEEING PLANT — FLOWEES 369 



minutes in boiling water, then for a day, or until 

 bleached, in strong alcohol. Then place the leaf 

 in a weak alcoholic solution of iodine. Does the 

 covered assume a color different from that of the 

 uncovered portion ? Explain the conditions of 

 the experiment and the result. 



-MoveTnents. 



If a Clematis be accessible, study the manner 

 in which the vine climbs. 



Note the position assumed at night by the leaf- 

 lets of the clover, bean, and locust. 



At the greenhouse procure vigorous specimens 

 of the sensitive plant, and by various methods, 

 which are left to the student to devise, test the 

 irritability of the leaves and study their change 

 of position. 



If specimens of the sundew and of Yenus's fly- 

 trap can be had, study the movements of the tri- 

 chomes and of the leaf-blade. If time permits, 

 repeat some of the experiments detailed in Dar- 

 win's " Insectivorous Plants." 



F. — Flo WEES 



Material. — In the case of large plants, as the cherry 

 and apple, bring to the laboratory some of the branches 

 with the flowers attached rather than the individual 

 flowers. 



As other specimens, bring violets or pansies, butter- 

 cups, morning-glories, dandelions, peas, or beans. 



For the study of the developing flower either fresh or 

 alcoholic material may be used. Forceps, scalpel, hand- 

 34 



