^^OGRAPHY OF PLANT&. 



CHAP. IV. 



t)N THE DISTRIBUTION OF PLANTS UPON THE 



EARTH. 



Linne, Stationes plantarum, in Amoen. Acad. vol. iv. 



<Jiraud Soulavie, Geographic physique de regne vegetal. 



F. Stromeyer, Historiae vegetabilium geographicae Specimen. ; Dissertatio» 



O. R. Treviranus, Biologic, b. ii. s. 4-4<, 137. 



Humboldt et Bonpland, Essai sur la Geo^aphie des Plantes. 



Willdcnow, im Magazin der Berlin, Gcsellshaft naturforschender Freunde. 



Wahlcnberg, Flora Lapponica. 



Dcsscn, Flora Cai^athorura principalium. 

 - Dessen, de Vegetatione et Climate Helvetiae septentrionalis. 



Brown's General Remarks, geographical and systematical, on the Botany 

 of Terra australis. 



Brown's Observations, systematical and geographical, on the Herbarium 

 collected by Professor Smith in the vicinity of Congo. 



Humboldt, Prolegomena ad nova genera plantarum. 

 ' Schouw, de sediblis plantarum originariis. 



Jahrbucher der Gewachskunde. 



Ritter's Sechs-Karten von Europa, mit erklarendem Text. 

 Titford's Sketches towards a Hortus botanicus Americanuso Table of cli- 

 mates and habitats of plants. 



mo. 



The geography of plants makes us acquainted with the 

 present distribution of plants upon the earth and in the 

 waters, and endeavours to refer their growth to external 

 causes. It is thus a part of the Physiology of Plants, since 

 it investigates the laws according to which climate, tempera- 

 ture, soil, elevation above the surface of the sea, and distance 

 from the equator, as also accidental external circumstances, 

 operate upon the production of plants. It is connected in some 

 measure with the History of Plants, or with investigations 

 respecting the origin, diffusion, and gradual distribution of 



