310 LUTHER BURBANK 



ing extensive series of investigations in this prac- 

 tically untrodden field. 



It should be recalled that all of our fruits, 

 even the hardiest ones that now grow nearly to 

 the Arctic zone, must have come originally from 

 the tropics, or at least from the milder climates. 



The fact that the plum, pear, and apple have 

 become hardy enough to resist winters of almost 

 arctic severity is in itself all-sufficient evidence 

 of the adaptability of the fruit bearers, and 

 should be an aspiring object lesson to the exper- 

 imenter with fruits that still retain the tropical 

 and subtropical habit. 



It requires no very great powers of prophetic 

 vision to forecast a day when a large number 

 of fruits that now are known only in subtropical 

 zones will have made their way, under guidance 

 of the plant developer, across many degrees of 

 latitude that at present seem like impassable 

 barriers. 



The Feijoa (pronounced fay-zho-a) or fig 

 guava (Feijoa Sellowiana) from Brazil, a vig- 

 orous fruiting shrub; the Cherimoya (Annona 

 Cherimolia) from the Central American high- 

 lands, which has been classed with the pineapple 

 and the mangosteen as making up the trio of 

 the world's finest fruits; the Australian Maca- 

 damia (Macadamia ternifolia), prized for both 



