THE ROSE FAMILY. 195 



IV. Construct a diagram of the flower. 



V. Does the structure of the flower present any adap- 

 tations to the visits of insects ? 



VI. How is the dissemination of seeds provided for ? 



RELATIONSHIP. 



I. With the cherry compare first the cultivated plum, 

 in flower about the same time. 



1. Note every point of difference between the two 



species, giving special attention to the structure 

 of the flower. 



2. Observe the points in which they agree. 



II. Compare the flowers of the peach with those of the 

 cherry and plum, noting the features in which all agree 

 and those in which they differ. 



III. Examine next the flowers of the pear or apple. 

 Make a longitudinal section, draw it and compare with 

 that of the cherry flower. Make successive cross-sections 

 of the ovary till one is found that shows the ovules clearly. 

 Draw and compare with similar sections of the ovary of 

 the cherry. 



IV. Make a similar study of the flowers of the straw- 

 berry. Indicate all the points in which they differ from 

 those of the cherry and apple. Compare longitudinal 

 sections of all three. 



V. Having made a further comparative study of as 

 many of the plants of this family as are available, sum- 

 marize the characters that you have found to be general, 

 taking leaves, fruit, etc., into account as well as the 

 flowers. 



