THE FRUIT AND SEED. 105 



peach, plum, or cherry, is called the endocarp. But 

 the endocarp of fruits is not always stony. "Whatever 

 its texture, the inner layer of a pericarp is named the 

 endocarp. 



MESOCAKP. Sometimes, between the outer and 

 inner parts of a pericarp, there is found a third layer 

 of different aspect, like the pulp of a peach. This 

 third layer is called the mesocarp. The distinction 

 between the epicarp and mesocarp is often very slight, 

 and then both together are called the epicarp. 



FIG. 213. 



In Fig. 213 e is the endocarp, s the mesocarp, and 

 g the epicarp. 



In Fig. 212 E is the epicarp, N the endocarp, and 

 S the seeds. At N is shown a slight development of 

 the mesocarp. Point out these parts in an apple and 

 a peach. Point out the parts of the pericarp in the 

 different fruits pictured upon the charts. 



Classify your collection of fruits by the structure 

 of the pericarp. Put by themselves all those that 

 have but one layer in the pericarp. Put those with 

 two layers an epicarp and endocarp by themselves, 

 leaving those with three layers epicarp, mesocarp, 

 and endocarp. Describe the layers that make up the 

 fruit ; that is, say whether, in each case, the layer is 

 pulpy, woody, stony, membranous, leathery, etc. 



