174 THE BEHAVIOUR OF PLANTS 
of the apple flower, and we should expect the flowers 
to be somewhat alike, though not entirely so. An apple 
fruit is sometimes called a pome. If you will compare 
it with the true berries, like the snowberry, gooseberry, 
etc., you will see that it is very much like a berry. 
The melon, marrow, cucumber, and other fruits of 
this kind form what is called a pepo. The outer part 
is supposed to be formed from the receptacle of the 
flower which here is united with the three parts of 
the compound pistil. You will remember that in the 
flower (Fig. 194) the calyx and corolla were seated on 
the end of the young marrow, which suggests that 
the receptacle here encloses and is joined to the 
pistil. How many chambers, or locules, are there in 
the marrow ? 
Acorn fruits. The fruit of the oaks is interesting to 
us all. Every one knows the acorns and the cups in 
which they rest. Well, the cup is a very singular part 
of the fruit. It perhaps represents a crown of tiny 
leaves around the base of the young flower. As the 
acorn was forming, these tiny leaves grew larger and 
were all joined closely together, so that they formed a 
cup which partly enclosed the acorn (see Fig. 245). 
In the hazelnut, chestnut, and beechnut a similar 
crown of leaves (in-vo-lu’cre) around the base of the 
flower forms the husk or bur in which the nuts are 
enclosed, and from which they are shelled when ripe. 

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