1914] CURRENT LITERATURE 1S9 



to the prospective planter. The science and practice of rubber-planting are 

 both new, and important developments in both are to be expected. Some of 

 the topics treated in the eleven chapters indicate the scope of the work : The 

 history of the use and cultivation of rubber; The botanical sources of rubber; 

 The physiology of latex production; Planting and harvesting operations; the 

 pests and diseases of Hevea; The chemistry of India rubber. 



Anyone who is familiar with Lock's Recent progress in the study of variation, 

 heredity, and evolution will know the accuracy and clearness with which the 

 present subject is presented. — J, M. C. 



The genus Sabicea. — Wernham* has published in book form a mono- 

 graph of Sabicea, which is the first of a series of monographs on Rubiaceae. 

 The genus belongs to tropical Africa and America, a large majority of the 

 species being " scrambling shrubs." The number of species reaches 105, and 

 62 of these are described as new. This is an indication of the harvest of new 

 species the tropics will yield when investigated. The monograph is more than 

 a description of species, for it includes a discussion and graphic illustrations of 

 their interrelationships. — J. M. C. 



Weeds. — With the increasing demand for practical lessons for children, it 

 is of interest to note the appearance of a booklet on weeds, by R. Lloyd 

 Praeger,s as one of the "Cambridge Nature Study Series." The titles of 

 the chapters suggest the contents: What weeds are; The life of a plant; 

 On weeds in general; Seeds and their ways; The war against weeds; Some 

 common weeds. — J. M. C. 



The fresh-water flora of Germany, Austria, and Switzerland. — This very 

 compact and well illustrated manual of the fresh-water flora of its region was 

 planned to appear in 13 small volumes, 5 of which have appeared and have 

 been noticed in this journal. Part 6 has now appeared, 6 dealing with three 

 orders of the Chlorophyceae, and prepared by Heering of Hamburg. — J. M. C. 



NOTES FOR STUDENTS 



Antarctic vegetation.— The activity in the south polar explorations during 

 the past decade and a half has added somewhat to the botanical knowledge of a 

 remarkably poor flora. In agreement with Skottsberg and others, Brown? 



4 Wknham, H. F., A monograph on the genus Sabicea. 8vo. pp. S2. pis. 12. 

 Published by the British Museum (Natural History). 1914. 



5 Praeger, R. Lloyd, Weeds; simple lessons for children. 8vo. pp. x+io-S. 

 fiP' 45- Cambridge University Press. 19 13. is. 6d. net. 



6 Pascher, A., Die Siisswasser- Flora, Deutschlands, Osterreichs, unci der Schv z. 

 Part VI. Chlorophyceae. 3 (Ulothricales, Microspores, Oedogoniales) by \V. 

 Heering. pp. 250. figs. 384. Jena: Gustav Fischer. 1914. 



7 Brown, R. \. R., The problems of antarctic botany. Scottish National Ant- 

 arctic Expedition 3:Bot. 3-20. Edinburgh. 191 2. 



