﻿BOTANICAL GAZETTE 



MINOR NOTICES 

 Plankton studies— Hans Bachmann 2 has issued a volume that combines 



the plant plankton of fresh water. The author follows Schroter in limiting 

 the use of the term plankton to those organisms whose own locomotion is power- 

 less to drive them against waves and currents. A contrast is made between the 

 plankton of lakes (limnoplankton) , small ponds (heleoplankton), and rivers 

 (potamoplankton). Following chapters on plankton technique and the physi- 

 cal constitution of the water is a chapter, making up the body of the volume, 

 dealing with the plankton constituents. The groups treated are the flagel- 

 lates, Peridineae, diatoms, Cyanophyceae, desmids, Protococcaceae, and 

 Volvocaceae. Owing to the minute descriptions, taking account of both ordi- 

 nary forms and variations, and ample keys, this work will be of great value to 

 all students of the phytoplankton. It will be of particular value as a manual 

 for the identification of many of our common fresh water forms. — H. C. Cowles. 



Flora of India. — The government of Madras has published a flora of a 

 region of India prepared by Professor Fyson^ of Presidency College. The 

 plants included are the wild and more commonly introduced flowering plants in 

 the neighborhood of the hill-stations of Ootacamund, Kotagiri, and Kodaikanal. 

 Nearly 500 species are described, 430 of which are indigenous, and nearly 

 half of these are restricted to the mountains of South India and Ceylon. Only 

 40 of them occur in China and Japan. The analytical keys, the remarkably 

 full descriptions, and the volume of illustrations make this manual exceedingly 

 serviceable to botanical students in a special region of India, and also to 

 botanists everywhere who are interested in the composition of the Indian 

 flora.-J. M. C. 



Fresh water flora of Germany, Austria, and Switzerland— This very com- 

 pact and well illustrated manual of the fresh water flora of this region, under 

 the editorship of Pascher, is planned to appear in 16 small volumes, 7 of which 

 have been published and noticed in this journal. The eighth volume to appear 

 (volume 5 of the series)" deals with Tetrasporales and Protococcales of the 

 Chlorophyceae, and is prepared by E. Lemmermann (Bremen), Jos. Brunn- 

 thaler (Wien), and A. Pascher (Prag).— J. M. C. 



2 Bachmann, Hans, Das Phytoplankton des Susswassers mit besonderer Beriick- 

 sichtigung des Vierwaldstattersees. 8vo. pp. 213. figs. 29. pis. 15. Jena: Gustav 



» Fyson, P. F., The flora of the Nilgiri and Pulney hill-tops (above 6500 feet). 

 2 vols. 8vo. Vol. I. pp. xxvi+475; Vol. II. pis. 286. Madras: Government 



* Pascher, A., Die Siisswasser-Flora, Deutschlands, Osterreichs, und der Schweiz. 

 Vol. V. Chlorophyceae 2 (Tetrasporales, Protococcales). pp. 250. figs. 402. Jena: 

 Gustav Fischer. 19 15. 



