52 Floristik, Geographie, Systematik etc. 



Dass diese Arten, wie vom Verf. näher auseinandergesetzt wird, 

 nach Schweden von Finnland her auf zwei Wegen, im Norden 

 und mehr südlich, eingewandert sind, geht aus den bisherigen 

 Angaben in der pfianzengeographischen Literatur nicht hervor. 



Grevillius (Kempen a. Rh.). 



Bartlett, H. H., Botanical Evidence of Coastal Subsidence. 

 (Science, N. S. XXXIII. p. 29-31. Jan. 1911.) 



This paper is the second of a series printed in Science on the 

 subject of coastal subsidence. Bartlett controverts the views of 

 D. W. Johnson, who Claims that salt marsh upbuilding can be 

 explained by a change in the configuration of the shore line without 

 subsidence and by a change of tidal level due to the alteration of 

 the coastal lines. In support of his contention, he describes the 

 growth of Spartina glabra and the formation of deposits of peat in 

 Chamaecypavis bogs and elsewhere that have been covered by salt 

 marsh deposits through the invasion of the sea. Harshberger. 



Johnson, D. W., Botanical Evidence of Coastal Subsidenre. 

 (Science N. S. XXXIII. p. 300—302. Feb. 1911.) 



This paper is the third of the series on the subject and discus- 

 ses the views of H. H. Bartlett's paper described above. Additional 

 evidence is presented to uphold the author's view that a change in 

 the configuration of the coast line is sufficient to explain the appa- 

 rent evidence of coastal subsidence. Harshberger. 



Bews, J. W., Vegetation of Natal. (Reprint, Ann. Natal Museum. 

 II. Pt. 3. p. 253—331. 1 map. 10 plates. 1912.) 



The author from Pietermaritzburg (Natal University College) 

 has examined the plant formations and gives here a general account 

 of their distribution and character. The major units of the Vegeta- 

 tion follow well-marked topographical features which can be followed 

 on a new contoured survey map of Natal (c. 30 miles to the linch). 

 From the coast to the Drakensberg, Natal presents three terraces 

 (about 300, 600 and 1000 metres respectively) with a mountain region 

 above 1500 m. The chief rivers cut back deeply into the higher 

 topography. The vegetations falls into groups: coastal belt, bush 

 and forest on S. E. slopes with the highest rainfall, Veld grassland 

 on plateaux and ridges, the rocky Valleys, and thorn Veld of the 

 broader lowland Valleys. 



The regional factors are fully discussed (p. 255—289). The soils 

 are generally derived from poor shales and sandstones, but locally 

 enriched by the frequent occurrence of intrusive basic igneous rocks, 

 Natal is a region of summer rainfall, and the higher hüls are 

 moister than the Valleys. The rain-clouds from the Indian Ocean 

 deposit first on the coastal belt, and the rising edge of each suc- 

 cessive terrace receives more precipitation than the intervening 

 terrace-plateaux. Mists also contribute largely to the water-supply 

 of plants. Extensive meteorological tables are given in support of 

 the conclusions on the distribution of Vegetation in relation to cli- 

 matic factors-rainfall and temperature at different periods of the 

 year. The author has also found great variations in illumination, 



