1 18 Floristik, Geographie, Systematik etc. — Pflanzenchemie. 



they are excellently reproduced. Reference to plant names and other 

 topics is rendered easy through two ver}^ comprehensive indexes. 



W. G. Smith. 



Wilson, M., Plant Distribution in the Woods of North- 

 East Kent. (Rep. Brit. Ass. Science, Sheffield, Sect. K. p. 787 — 

 788. 1910.) 



The area presents little Variation in altitude, so that the plant 

 distribution depends on other factors. The following types of wood 

 have been distinguished in the district: Beech, Ash-hazel, Chestnut 

 (Castanea), Oak-birch-heather, Oak. The geological strata on which 

 these occur, and the more important undershrubs and ground Vege- 

 tation are given briefly. A large proportion of the woods occur as 

 "coppice with Standards", most of the taller trees being removed 

 about every fourteen years. Observations were made on the chan- 

 ges produced on the undergrowth by Clearing and by subsequent 

 shade due to renewed canopy. During the later years under cop- 

 pice there is deep shade, so that the herbaceous plants may be 

 grouped into spring-flowering species little affected by the shade, 

 and dwarf plants of species which persist in the vegetative State; 

 during this period there is an increase in the amount of humus. 

 After the trees are removed, there is increased light and increased 

 temperature of the surface soil so that the herbaceous plants enter 

 on a period of greater activity. These may be grouped into species 

 which have survived the shade period and now develope luxuriantly, 

 and woodland species, mainly biennials, which reappear in the 

 light period but are unable to exist during the shade period. The 

 maximum development of herbaceous plants is reached about the 

 third year after telling. The communication was a preliminary one 

 and further results may be expected. W. G. Smith. 



Abderhalden, E., Biochemisches Handlexicon. I. 1. u. 2. 

 Hälfte. (1499 p p.). IV. 2. Hälfte (p. 353—1190). (Berlin, 1911. 

 Jul. Springer.) 



Mit den hier vorliegenden 3 Bänden ist das umfangreiche, 9 

 grosse Bände umfassende Werk nunmehr abgeschlossen, in kaum 

 zwei Jahren ist das Ganze fertiggestellt. Der 1. Band behandelt 

 Kohlenstoff (von A. Thiele) und Kohlenwasserstoffe (natürliche 

 Bitumina und aromatische Kohlenwasserstoffe) von F. Baum, Alko- 

 hole von O. Gerngross, Phenole von H. Einbeck, aromatische 

 Alkohole von L. Pincussohn, aliphatische Aldehyde und Ketone 

 (von A. Thiele), ebensolche der aromatischen Reihe (E. Witte), 

 Fettsäuren und mehrwertige Säuren (E. Schmitz, A. Thiele), Säu- 

 ren der aromatischen Reihe nebst solchen unbekannter Constitution 

 (A. Thiele, M. Dohrn), heterocyclische Verbindungen (K. Kautzsch). 



In der 2. Hälfte des IV. Bandes sind nach einem kurzen Nach- 

 trage zu den Polypeptiden (von K. Raske) seitens einer Mehrzahl 

 Bearbeiter die annähernd die Hälfte dieses Bandes einnehmenden 

 Aminosäuren behandelt. Hier werden der Reihenfolge nach be- 

 sprochen: Abbau der Aminosäuren im Organismus (von O. Neu- 

 bauer), Glycocoll und Derivate (H. Scheibler), Alanin, Serin, 

 Valin, Leucin, Isoleucin (von G. Zemplön), Asparagin, Glutamin 

 und Verwandte (von H. Pringsheim), Arginin, Ornithin (von E. 

 Winterstein und G. Trier), Cystin und Cystein (von G. Zemplen) 



