TBjE drupw 



257 



245), it becomes greatly thickened and fleshy; but 

 the interior develops a hard stone or pit. This 

 pit (or putamen, as it is sometimes called in 

 botanical writings) contains a distinct and separate 

 seed, so that it is clear that the walls of the pit 

 could not have developed from the ovule. The 

 entire integument, then, must be pericarp. In such 

 kinds of differentiation of the walls of the peri- 

 carp, the outer soft 

 portion is commonly 

 called the exocarp 

 (or sarcocarp) , and 

 the inner firm por- 

 tion 



Pig. 245. 



(the pit) 

 the endoci 

 An entire fruit of this character, - 



ig Cross-section of young 

 „ , ,, T apricot fruits. 



called the endocarp. 



FiO. 244. 



^Z^^St.^ ^i*h ^ pit or stone and a fleshy 

 covering, — is a drupe or stone fruit; 

 and it differs from the drupelet only in the fact 

 that it is larger and is borne singly. 



301. If one were to cut across young apricots, 

 peaches or plums, he would find that the stone 

 is for a long time thin and soft. He would also 

 find, as a rule, only one seed, as at a. Fig. 245, 

 and we know that a peach pit or plum pit gen- 

 erally has but one "meat." Now and then he may 

 find two seeds (6), either one or both of which 

 may develop. Very often one of these seeds is 



R 



