INFLUBSCE OF POLLEN UPON THE FRUIT 315 



Suggestions. — These facts are most suggestive. The pupil will 

 now want to cut every one-sided apple to see if its unsymmetry 

 may be due to lack of pollination. When he is crossing plants 

 (Obs. xlvi.), he will want to experiment with much and little pollen 

 and by putting pollen upon only a part of the stigmas. He will 

 wonder whether one reason why cultivated apples grow so much 

 larger than wild ones is because only one fruit commonly develops 

 in each cluster (Fig. 46), and whether this is the one which chanced 

 to receive the most pollen. He may even question if the reason 

 why only one develops is because there is insufficient pollen for 

 the fertilization and stimulation of more than one. 



