NATURE-STUDY LESSONS. 93 



45. (a) How do the scapes in the two latter cases 



compare in length ? 



(b) Infer the purpose to the plant of these differ- 



ences in the length and direction of growth 

 of the scapes. 



(c) Infer also one of the conditions essential to the 



proper development of the flowers. 



46. {a) Observe the appearance of the flowers at night. 

 {b) Describe it. 



(c) When does this change take place ? 



(d) How is the closing effected? 



47. (a) Examine carefully a closed flower. Are all the 



circles of bracts folded about the flowers ? 



(b) Describe the positions of the outer and inner 



circles of bracts respectively. 



(c) Infer the purpose now served the flower by the 



inner circle of bracts. 



48. (a) Observe the flower on the coming of rain and 



during cloudy weather. 



(b) What change takes place ? 



(<r) Examine a closed flower and determine 

 whether rain and moisture could easily 

 enter it in this condition. 



(d) Infer one purpose served by its closing on the 



coming of rain. 

 {e) Infer also why it closes at night. 



49. (a) Mark several flowers with a string or label and 



note carefully two or three times a day the 

 changes that take place in them. 

 {b) Describe the changes that take place in the 

 scape. 



(c) What purpose is served by this change? 



