122 NATURE-STUDY LESSONS. 



42. How do the number of vertical whorls of leaves 

 in the one compare with that in the other on the same 

 length of stem ? 



43. Make similar observations of the leaves of other 

 erect plants. 



44. What is your conclusion with respect to the rela- 

 tion between the width of the blade and the number of 

 vertical whorls on the erect stem ? 



45. Make a list of plants observed in this respect. 

 What adaptation here becomes evident? 



F. Belation of Length of Petiole to Leaf-position. 



46. (a) Examine the bellflower (Campanula), or early 



saxifrage, or robin's daisy, or plantain, or 



dandelion, from the direction in which the 



sunlight strikes it. 

 (J>) Describe its appearance from this view-point. 

 (<:) Account for the formation of the rosette of 



leaves. 



47. What purpose is served by its having the lower 

 leaves with long petioles and the higher ones with shorter 

 ones ? 



48. Similarly, observe the leaves of the begonia. 



49. Make a list of plants in which you have observed 

 a similar adaptation. 



XXXI.-SEEDS. 



I. In the fall of the year, collect a number of seeds ot 

 each of the following : — beans, peas, Indian-corn, morn- 

 ing-glory, maple, squash. Bottle and label each kind. 

 {a) Compare the different ways in which these seeds 



are protected by the plant. 

 {p) Soak some of each for a day before examining 

 them. 



