72 THE AMERICAN NATURALIST. [VoL. XXXV. 
second part, and contains descriptions of a considerable number of 
new species. 
Professor Ascherson contributes a synopsis of the higher vegeta- 
tion of Helgoland to Vol. IV, N.F., of the Wissenschaftliche Meeresun- 
tersuchungen of the Commission for the Scientific Investigation of the 
German Sea. | 
Part I of the third volume of Boerlage's Handleiding tot de kennis 
der flora van nederlandsch Indie, comprising the orders Nyctaginacez 
to Casuarinacez, has recently appeared. 
A series of contributions to the knowledge of the trees of Java, by 
Koorders and Valeton, is appearing in current numbers of the 
Mededeelingen uit 's Lands Plantentuin, of Buitenzorg. 
A paper on “Some Plants of West Virginia," by E. L. Morris, is 
published in the Proceedings of the Biological Society of Washington, 
under date of October 31. 
A number of papers on the plant geography of North America, 
presented at the New York meeting of the American Association for 
the Advancement of Science, are published in abstract in recent 
numbers of Science. 
A delightfully simple elementary statement of “ How Plants Live 
Together,” by Bailey, constitutes Zzacher’s Leaflet, No. 19, of the 
Cornell University Experiment Station. 
An ecological comparison of the arctic and antarctic floras, by 
Delpino, is reprinted from the publications of the Æ. accademia delle 
Scienze dell istituto di Bologna for 1900. 
The structural and superficial modifications induced in a number 
of succulents, when grown with a liberal supply of moisture, are 
considered by Brenner in an illustrated paper in ora for October. 
Die Gartenwelt for October 27 contains an interesting statement 
by M. Correvon of the successful manner in which he cultivates 
Alpine plants in the crevices of a wall in the suburbs of Geneva, and 
is illustrated by several hal 
| f-tones, — among them a superb portrait 
of Saxifraga longifolia. 
Bulletin 46 of the Agricultural Experiment Station of the Univer- 
sity of Nevada, which is No. 2 of the nature-study bulletins of that 
institution, deals with the flowers and fruits of common trees and 
shrubs. Bulletin 47 of the same series considers clover seeds and 
their impurities. Both are well illustrated. | 
