THE FLOWER. 27 



upon the receptacle, and the calyx also is inserted 

 upon the receptacle. 



FIG. 21. 



Look at the magnified flowers shown in section 

 on chart 1, and point out the receptacle in each case. 

 Are all these receptacles alike in form ? State, in re- 

 gard to each flower, where the pistil is inserted ; where 

 the stamens ; where the corolla ; and where the calyx. 

 Which floral whorl in each flower occupies most space 

 upon the receptacle ? Are these flowers perfect ? Are 

 they complete ? Are they symmetrical ? 



Repeat these observations upon the magnified 

 flowers shown in section in chart 2 ; in charts 3, 4, 5, 6. 



Make a longitudinal section of each of your liv- 

 ing flowers, and look for the insertion of the floral 

 organs. If you sometimes fail to discover it, do not 

 be discouraged. It will not, of course, be as clearly 

 visible as it is shown to be on the chart. Try again 

 another time. Make frequent attempts, as failure is 

 often due to lack of experience. 



