298 Matthews.—Distribution of Portions of British Flora. I. 
Scharff, R. F. (1902) : Some Remarks on the Atlantis Problem. Proc. Roy. Irish Acad., 
vol. xxiv, B. ,p. 268 . 
-(1912) : The Relation of the Present Plant Population of the British Isles to the 
Glacial Epoch. Irish Nat., vol. xxi, p. 105 . 
Seward, A. C. (1911): Links with the Past in the Plant World. Camb. Univ. Press. 
Stapf, O. (1914): The Southern Element in the British Flora. Engler’s Botanische Jahrbiicher, 
Bd. 1, Supplement-Band. p. 509 . 
- (1916) r A Cartographic Study of the Southern Element in the British Flora. Proc. 
Linn. Soc., 129 th Session, p. 81 . 
"W arming, E. (1903) : Botany of the Faeroes, pt. 2 , p. 660 . 
W atson, H. C. (1835) : Remarks on the Geographical Distribution of British Plants. London. 
—-- (1847) : Cybele Britannica. 4 vols. London. 
-— (1883) : Topographical Botany, Ed. 2 . London. 
WiLLE, N. (1915) : The Flora of Norway and its Immigration. Ann. Missouri Bot. Gard., vol. ii, 
P- 59- 
Willis, J. C. (1915) : The Endemic Flora of Ceylon. Phil. Trans. Roy. Soc. London, B., 
vol. ccvi, p. 307 . 
•- (1916) : The Distribution of Species in New Zealand. Ann. Bot., vol. xxx, p. 437 . 
■- (1919) : The Floras of the Outlying Islands of New Zealand and their Distribution. 
Ibid., vol. xxxiii, p. 267 . 
--(1920) : Plant Invasions of New Zealand. Ibid., vol. xxxiv, p. 471 . 
Numerous other papers by the same author in the Annals of Botany. 
-(1922) : Age and Area. Cambridge University Press. Contains an extensive list of 
literature. 
