MISCELLANEOUS PLANTS 289 



widely scattered. Professor Asa Gray lists seven species of 

 Allium as growing wild in northeastern North America, only 

 one of which is naturalized from Europe. May not this also be 

 a case of multiple domestication, if the writer may coin a term 

 to indicate what he believes to have been a common thing in 

 the early days of civilization .? 



The beet {Beta vulgaris). Whether as a garden delicacy or a 

 food for stock, this plant is no mean addition to our gardens 

 and fields, but as a sugar plant it ranks as of prime importance. 

 It is the one plant that has made sugar production possible in 

 the temperate zones. Beginning with but 3 or 4 per cent of 

 sugar, by careful breeding it has been raised in sugar content 

 till whole fields average 14, and single specimens have been 

 found above 25 per cent. This achievement is mainly the re- 

 sult of German enterprise, and shows what science can do 

 when applied to the ordinary affairs of life.^ 



The beet yet grows wild in the Canary Islands and all along 

 the Mediterranean, and as far east as Persia and Babylon. It 

 was cultivated by the Greeks and Romans, though its varieties 

 have been greatly increased of late ; indeed, it seems to be one 

 f these fortunate species that is growing in favor, just as salsify 

 IS as certainly dying out. 



Manioc, or mandioca {Manihot utilissima). This plant, of great 

 significance in tropical agriculture, would not be mentioned here 

 ( xcept for the fact that it is almost undoubtedly another of the 

 American, and therefore comparatively late, contributions to the 

 L^riculture of the world, and except for the further fact that it 

 is the source of our tapioca of commerce. The arguments for 

 its western nativity lie in the fact of its comparatively ancient 

 c ultivation in tropical America, and the further fact that the 



* This was not the result of accident, but of deliberate determination. The 



' (rrmans felt the disadvantage of depending solely on the tropics for their 



i^ar supply, and government chemists were set at work to discover, if possible, 



sugar-bearing plant that could be raised in their latitude. The result is that 



et sugar can compete in price with the cane, and the quality is not only 



equal but identical. 



