PLANTS AND THEIR SOILS. 



II. Ptam's belonging to sandy soils. Horny Lotus, Lotus 



corniculatus (order Rhamnacece). Little Harebell, Cam- 

 panula rotundifolia (order Campanulacecz). Eyebright, 

 Euphrasia officinalis (order Scrophulariacece). Anthox- 

 anthum odoratum. 



III. Plants belonging to argilo-calcareous soils. Coltsfoot, 

 Tussilago farfara (order Composites). Wild Mustard, 

 Sinapis arvensis (order Cruciferce). Buckwheat, Poly- 

 gonum aviculare (order Polygonacecz). 



IV. Plants belonging to a sandy and calcareous soil. Broom, 

 Genista scoparia (order Leguminoscz). Centaury, Cen- 

 taurea nigra (order Gentianacece). Galium verum (order 

 Rubiacea). The Jacobea, Seneecio Jacobcea. 



V. Plajits belonging to alluvial and marshy soils. Reed, 

 Arundo phragmites, Poa aquatica, Poafluitans. Rush, 

 Juncus conglomerate (order Juncacece). 



After these different soils have been brought under cultiva- 

 tion, the characteristic species, which we have just enumerated, 

 disappear, and are replaced by other plants, which grow, to all 

 appearance, spontaneously, under the name of weeds; but, in 

 reality, spring from germs or seeds too frequently mixed up 

 with the different manures, or spread abroad by the agency of 

 birds or the wind. 



In reference to this latter consideration, the diffusion of 

 plants, we shall transcribe an interesting passage from Balfour's 

 excellent " Manual of Botany." 



' Some plants," he remarks, " are disseminated generally over 



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