250 Introduction to Botany. 



does it ever close again ? Tie a string loosely around a 

 peduncle to mark it, and observe the behavior of the inflo- 

 rescence on cloudy and bright days, and at different times 

 of the day, beginning at early morning. Try to conceive 

 the significance of what you find. 



Follow the changes occurring in the parts of the flower 

 up to the time of the scattering of the fruit. Make draw- 

 ings to show the main facts, and in connection with them 

 tell what these facts signify. 



Erigeron. (Any obtainable species.) 



Study the inflorescence and flowers as directed under 

 Taraxacum, and compare the two genera by means of 

 drawings and notes. 



