2S8 



these pestiferous plants. This collection will be made np from 



■ 



scores of reports of American botanists upon the twenty worst 

 weeds in their locality, and therefore will be representative of the 

 various regions of the United States. In the future it is ex- 

 pected to supplement this collection with one of the seeds of the 

 same species, and continue the work until the weeds of America 

 are fully represented in the economic and other herbaria of the 

 country. While more particularly designed for the agricultural 

 colleges and experiment stations, this collection of injurious 

 plants cannot but be of interest to the general systematic bota- 

 nist. The price is not yet fixed upon, but will not be far from 

 eiglit dollars for the first century. Dr. Halsted desires that all 

 who are interested will send their word of encouragment to him. 

 The work is a vast one' and entirely one of lo\'e for the cause of 

 a better understanding of our weeds by the one wlio is enijaged 

 in the enterprise, namely, Byron D. Ilalsted, New Brunswick, 



N. J. 



Reviews of Foreign Literaturoc 



Int'roductio)! to Frcs/i -water Alg^r, "anth au EniiDicration of all 

 the British Species, M. C. Cooke, (Svo. |)p. 334; 13 plates, 

 London, 1890. International Scientific Scries). 



This is a convenient little laboratory book, giving illustrations 

 of all the genera of fresh-water Alga^ known in Britain, and as 

 these are nearly all common to North America it will be found a 

 useful adjunct to Mr. Wollc's publications in this country. The 

 subject is treated in a popular, rather than a strictly scientific 

 manner. Directions are given for the collection and preservation 

 of the plants, their methods of growth and reproduction are de- 

 scribed and tlieir phenomena of spontaneous movement com- 

 mented upon. 



Dr. Cooke does not take much stock in the recent classifica- 



+ 



tion of Alga^ proposed in Bennett and Murray's " Cryptogamic 

 Botany," nor in what he is pleased to call the " dual hypothesis '' 

 of the nature of lichens, both of which are denounced in no un- 

 certain laneuaue. This and other considerations have induced 



fci""fc> 



a scathing review of the book by Mr. Geo. Murray in the ''Jour- 

 nal of Botany," for August, In which such useful phrases for 



