138 THE JOURNAL OF BOTANY 



Potamogiton jav aniens, they are cited as only probably occurring. 

 Two species of Najas are mentioned — N. graminea, which has 

 been found once, and N. marina (wrongly quoted as N. major), 

 which " probably occurs " ; Dr. Koorders has omitted N.falcicu- 

 lata A. Br., a plant collected in Java by Horsfield, and duly 

 recorded in the monograph in the Pflanzenreich. 



Similarly, in the second volume, some families, such as 

 CasuarinacecE, Piyeracece, and in part RosacecB, are treated mono- 

 graphically ; while in others, such as Leguminosce, Euphorbiacece, 

 and, in fact, the majority, there is nothing beyond the (very full) 

 clavis treatment. Under Casuarina a useful account is given of 

 the occurrence, distribution, and general character of the Javanese 

 species, of which there are two, C. montana, with two varieties, 

 which forms great forests, and is known elsewhere only from 

 Timor and Bangka, and the widely spread C. equisetifolia, which 

 is a strand-plant in West Java. In the elaboration of the Piper- 

 acece, which are treated somewhat exhaustively, the author has 

 the assistance of M. Casimir de Candolle. The. genus Quercus, 

 with twenty-five species, is also worked out in detail, with useful 

 figures of the fruits. 



The photographic plates illustrate phases of vegetation in the 

 island, and there is also a coloured plate of Trichosporum 

 pulchnmi, copied from the Botanical Magazine, for which it is 

 not easy to account. The text-figures, excepting those in the 

 accounts of Podocarpus, Pandanus, and a few similar cases, 

 appear very spasmodically, and it is difficult to understand 

 their distribution. But these are minor points and do not 

 detract from the great value of Dr. Koorders's contribution to 

 a systematic knowledge of a varied and interesting flora. We 

 trust that the remaining volume, which we note is promised for 

 May of the present year, may not be unduly delayed ; a working 

 handbook on the flora of Java will be a great boon to the 

 systematist. A B R 



Types of British Vegetation. By Members of the Central Com- 

 mittee for the Survey and Study of British Vegetation. 

 Edited by A. G. Tansley, M.A., F.L.S., University Lecturer 

 on Botany in the University of Cambridge. With 36 plates 

 and 21 figures in the text. Cambridge University Press. 

 Pp. XX, 416. Price 6s. net. 



Well may Mr. Tansley confess in his preface to this excellent 

 little work that the title chosen by himself and six other energetic 

 workers in ecology is " somewhat ponderous," so that they are 

 fain to shorten it to " the British Vegetation Committee " or to 

 "the Central Committee." The Committee, in spite of its title, 

 is, however, to be congratulated on this work which it has — with 

 some outside assistance — accomplished, and on having chosen in 

 Mr. Tansley a most efficient editor ; whilst English botanists as a 

 body are, we think, to be equally congratulated on what is practi- 



