

Sect. XVII. 1.2. 



ROOTS AND BARKS. 



473 



whicl 



\ 



cyare 



i'oduce 

 > root, 



future 

 fpring 

 id bar- 



' roots, 

 3ts are 



feeds, 

 a their 



a; 



the 



alfo lay 

 , for the 

 Df fugar 

 ed, that 



of part- 

 ible fla- 



menting 

 illons 

 Vol. II 



un 



dation 



arating 



sp 

 ntity 



I 



licb 



irian- 



« 



fifts of a magazine of nutritious matter, previous to the elevation of 

 the flower-ftem, as the radifh, rhaphanus fativus, and carrot, and 

 beet, when fown early. I neverthelefs fufpcd that thefe, as well as 

 the preceding, confift in reality of two fuccejffive plants ; that which 



forms the knobby root, and that which is formed from it, as fpoken 



of in Se£l. IX. 2' ^' 



For the production of roots of thefe kinds, which are immediately 



or fecondarily propagated from feeds, our attention muft be applied 

 to colledl the forwarded feeds, and from the beft plants of the kind ; 

 and to fow them at the proper feafon of the early fpring, or early au- 

 tumn ; and in a foil which contains fufficicnt vegetable nourifhment, 

 obfervino:, neverthelefs, that as carrots, parfnips, beets, and radifhes 



fift of knobs formed in the ground 



lefs adhefive foil 



be 



feleiSted 



abounding with (iliceous or calcareous fand, as well 



as with carbonic earth. But as the turnips are formed chiefly above 



ground, this attention to the cohefion of the foil becomes lefs necef- 



... 

 fary, fo that it is fufEciently penetrable by the fibres of their ra- 



dicles. 



There is another art of producing larger roots from feed, and at 

 an earlier feafon, as of radifhes ; which is by fowing them in hot- 

 beds in the early fpring, and expofing the tops to the cold air during 

 the day, as this prevents the luxuriant growth of the fummit, and 

 increafes that of the root. 



2. Other tuberous roots are generally propagated by fubterraneous 

 wires, or root-buds, from the tuberous roots of their parents through 



a 



long 



generation, and not either primarily or fecondarily from 

 feeds ; as the potato, folanum tuberofum ; and the ground artichoke, 

 or tuberous fun-flower, helianthus tu^berofus ; and perhaps the pier- 

 nut, bunium bulbocaftanum. 



As the tuberous :;oots of the potato planted in the fpring not only 

 produces many other fimilar tuberous roots. 



the fummer 



but flowers alfo during: 



I was led to fufpe£t, that pinching off the flow 



3P 



as 



they 



