544 REVIEWS. 



Schulz, 0. E. Bidens chinensis (L.) Willd. und verwandte 

 Arten. Engler's Botanische Jalu'bucher, Fmifzigster Band, 

 Supplement Band, Fest-Band fiii- A. Engler, 1914, pp. 176-187. 



The author separates Bidens chinensis (L.) Willd. from 

 Bidens pilosus L. His references to Ceylon specimens and 

 records are as follows : — 



Bidens chinensis (L.) Willd., Moon Catal. Ceyl., p. 57. 

 Bidens pilosus Trimen, Flor. Ceyl., III., p. 40 ; Thwaites, 

 Enmn. Plant. Zejd., p. 165. Ceylon-tea vel Wal-te-kola 

 Ceyl. ex Moon et Thwaites. Hab. Ceylon prope Mgandamalej , 

 Klein ; prope Kaltvira, ex Moon. 



Bidens bipinnatus L. Bidens decompositus Wall., Thwaites 

 Enum. Plant. Zeyl., p. 165. Bidens pilosus Li. var. b. bipin- 

 natus Trimen, Flor. Ceyl., III. (1895), p. 41. Hab. Ceylon in 

 distr. Batticaloa hand frequens, ex Thwaites. 



With regard to the first of these species, the author states 

 that specimen No. 15023 in Herb. Willdenow, named Bidens 

 chinensis Willd., was collected by Klein on February 29, 1796, 

 at Mgandamalej in Ceylon. We have no knowledge of Klein 

 or Mgandamalei. 



"-er- 



Czapek, F. Uber die Blattentfaltung der Amherstieen. Sitz- 

 xuxgsberichte der Kaiserl. Akad. der Wissens. in Wien, Mathem.- 

 naturw. Klasse, Bd. CXVIII., Abt. 1. 



The author carried out experiments with Amherstia 

 nobilis, Humboldtia laurifolia, Broimiea grandiceps, and 

 Saraca indica, at Peradeniya. His conclusions are as 

 follows : — 



The hanging position of the young twigs of Amherstia and 

 the yovmg leaves of Humboldtia, Broionea, and Saraca is not 

 a consequence of a " turgorless condition " during their early 

 stages of development, but is correlated with the plastic 

 condition of the tissues owing to the absence of the mechanical 

 elements. 



The erection of the leaves of Amherstia is brought about 

 by a geotropic growth curvature in the primarj^ leaf nodes. 



The biological importance of the hanging position primarily 

 depends on the protection from excessive insolation which it 

 alfords the young leaves. 



Dingier, H. Versuche uber die Periodizitat einiger Holzgewa- 

 chse in den Tropen. Sitzungsberichte der Koniglich ]3ayerischen 

 AivfKltinio dor Wissenschaften, Math.-physik. Klasse, Jahrgang 

 1911. 



Trees of several deciduovis species were lopped and all 

 loaves removed in November-January, prior to the normal 

 time of leaf-fall. In general the trees produced new loaves, 

 winch persisted tlu-ough the dry months, when untreated 

 trees of the same species were leafless. The cxporimonts 

 won- couductotl at I'eradeniya. 



