MORPHOLOGY AND ECOLOGY OF THE FRUIT 249 



It is not worth while to give students unusual terms, such as 

 sarcocarp, etc., which are not used in descriptive works, but 

 follicle, legume, drupe, etc., should, of course, be supplied as 

 they are needed. 



The true morphology of the fruit should be taught; e.g. in 

 the Apple, the flesh is mainly receptacle, with a little of it from 

 carpel ; in the Cranberry, it is receptacle, etc. Particularly 

 important is a clear idea of the Cherry, with part of the carpel 

 forming stone and the other part pulp. Something similar to 

 this separation occurs in the Orange, where the skin is sepa- 

 rable ; it is a part of the carpels. The pulp of the Orange 

 is a growth of hairs from the inner (upper) faces of the car- 

 pellary leaves, though these hairs are not unicellular. The 

 whole subject of the morphology of the pulp is of great inter- 

 est ; it originates in a variety of ways. An account of seed 

 locomotion (a subject always of great interest to students) 

 should be taken up here in much more detail than was pos- 

 sible near the beginning of the course. 



It may be noted here, by the way, that the word " ecology," 

 so often used in this work (spelled cecplogy in the Century 

 Dictionary, and defined there) is coming rapidly into general 

 use to express adaptation of plants and their parts to external 

 conditions. 



