288 



LSSSOJfS WITS PLANTS 



suppose that the cup of the acorn or the easily- 

 dehiscent bur of the beech -nut was developed as 

 a protection. The explanation lies farther back 



Fig. 295. 

 Section of an apple. 



Fig. 290. 

 Section of ap apple 



than any mere assumption of present needs or 

 functions. Therefore, 



339. The lesson is, that the pupil should first 

 discover facts without reference to any preconceived 

 explanation of them, and each fact should be in- 

 terpreted chiefly upon its own evidence. (See 423.) 



Suggestions. — The fruits of most of our forest trees belong to 

 the various types or classes of fruits which we have now discussed. 

 The teacher may think it worth the while to interest the pupils in 

 making a complete collection of the fruits and seeds of the forest 

 trees of the neighborhood, with the expectation, however, that the 

 samples are to he of less value as a mere collection than as a 

 means of awakening the pupils' interest in the collecting and in 

 the subject (see "Suggestions," Obs. li.). They will also be useful in 

 the school -room teaching, particularly in stormy weather, when fresh 



