CH. VII, 6] ECONOMICS OF FRUITS 371 



plant energy from superfluous vegetation to optimum fruit, 

 formation ; grafting to preserve and multiply a desirable new 

 varlety^br sport ; spraying and other like methods, including 

 tKtTlls'e' Of po!^6nous gases, to combat parasitic fungi and 

 insects; plant breeding lOi 1 liie development of better or im- 

 mune new" kinds; and ventilation, of greenhouses or store- 

 houses, to aid the larger plants and fruits in resisting dis- 

 j?ase Fungi_ Fine fruits are commonly wrapped individually 

 for transport, chiefly to prevent the breaking of the skin, 

 which not only injures their appearance, but breaks their 

 first line of defense against Fungi. 



