Woodhead : Plant Geography in Simtzerland. 207 



disputed by Schroter, and also by Nageli, who point out that 

 some areas previously covered by ice have later become occupied 

 by these plants as a resultjof normal modes of plant dispersal. 



The most recent, and in many respects the best and most 

 elaborate of these monographs, is that by Dr. Brockmann- 

 Jerosch,* In this work, extending over 400 pages, we get 

 probably the most complete analysis of the plant associations 

 of a small area that has ever been attempted. Prof. Schroter's 

 work has been criticised for the great sub-division of types of 

 meadow vegetation, but Brockmann's researches in the Puschlav 

 tend to strengthen his position, and to shew in a striking manner 

 the ecological significance of these associations. It is the most 

 characteristic piece of work of the Schroter School. 



Rikli f gives a very complete summary of the plant associ- 

 ations, regions, and phytogeographical elements of the Kanton 

 Tessin, as well as of the Lagern, at the end of the Jurassic 

 chain in Kanton, Ziirich, and he has also prepared a very 

 thorough monograph on the distribution of Pinus cemhra in 

 Switzerland, which will be issued during the present year. 



Chenevard (Geneva) has published many papers on his in- 

 vestigations of the Flora of Tessin, and Baer, a pupil of Schinz, 

 has contributed much to the knowledge of the Kanton. 



R. Keller has written a detailed account of the Corylus 

 association at Val Blenio. J 



On the floristic side, and the work of greatest use to those 

 preparing these Swiss monographs, is the excellent ' Flora der 

 Schweiz,' by Schinz and Keller (2nd Ed., 1905). Advances 

 made in the knowledge of the Swiss flora are contributed to 

 the ' Beitrage zur Flora der Schweiz,' by Schinz and his pupils, 

 and in ' Fortschritte d. Schweizerischen Floristik,' in the 

 bulletins of the Swiss Botanical Society, formerly by 

 Schroter, now by Rikli. The near future will see the 

 publication of further monographs on similar lines by students 

 of Profs. Schroter and Schinz, e.g., Dr. Grisch on the flora of 

 the Bergunerstocke,§ A. Geilinger on the Grigna, and F. Jaggli 



* H. Brockmann-Jerosch, ' Die Flora des Puschlav und ihre Pflanzen- 

 gesellschaften.' Leipzig, 1907. 



t M. Rikli, ' Zur Kenntniss der Pflanzenwelt des Kantons Tessin.' 

 Berichte d. schweiz. bot. Ges,, Heft XYI., Bern 1907. ' Das Lagern- 

 gebiet,' phytogeogr. Studie XVII., 1908. 



X R. Keller, ' Vegetationsbilder aus dem Val Blenio. Mitt, naturw. ges. 

 Winterthur, 1903-4. 



§ Grisch, ' Beitrage zur Kentniss der Pflanzengeographischen Ver- 

 haltnisse der Bergiinerstocke.' Beihefte d. bot, Centralblatt, 1907. 



1908 June I. 



