256 



ZESSONS WITE PLANTS 



Pig. 242. 



Proliferous fruit of 

 strawberry. 



upon the bush when the raspberry is picked, is 

 the receptacle. The pupil should now explain the 

 morphology of the blackberry. 



299. The pupil will now be in- 

 terested in peaches, apricots, plums 

 and cherries. He has seen the 

 structure of the flower in Figs. 47, 

 48, 144. There is a single superior 

 pistil. The petals and stamens 

 are perigynous, and both fall soon 

 after fertilization has taken place. 

 The gamosepalous calyx (or re- 

 ceptacle-tube, 170) persists for a 

 time, but finally breaks away at the base, and 

 the ring gradually works off over the top of the 

 swelling fruit (Fig. 

 244) . In these fruits, 

 therefore, only the 

 ovary and its con- 

 tents persist and 

 ripen into the fruit, -^r pia. 243. 



Fruit of raspberry. 



299a. Why does the ring 

 slip off, rather than break in two f Do peaches, cherries and 

 plums behave in the same way 1 Are there similar rings on young 

 apple and pear fruits ? 



300. As the fruit continues to grow (Figs. 31, 



