644 Journal of Applied Microscopy. 



flowers by means of diagrams, morphology, and classification of cryptogams, on 

 nomenclature, and on the collection and preservation of specimens. 



The first part of the book, dealing with morphology, is occupied largely by 

 descriptions of the flower, seed, root, stem, and leaf. 



The second part, devoted to histology, gives descriptions of the cell, cell contents, 

 reactions of cell constituents, and an account of the tissues of higher plants, with 

 particular reference to features of special interest to students of pharmacognosy. 



In both parts the illustrations are numerous and very many of them are 

 original. c. j. c. 



., , ^ ^. x^. Tr- . , This is one of the most important con- 



Karsten, George. Die Diatomeen von Kiehler "^ 



Bucht. Wissenschaftliche Meeresuntersuch- tributions to the literature of Diatoms 



ungen. Herausgegeben von der Commission ^j^j^j^ j^^^ g^- ^^^^ j^^^g_ -p^e work 



zur Untersuchung der deutschen Meere in ■' 



Kiel und der Bioiogischen Anstalt auf Hel- must be regarded not merely as a 



goland. Abth. Kiel. N. F., IV, 19-295, jjg f^j. ^^e determination of the 



219 text figures, 1099. ° . 



species of a limited locality, but rather 



as a comprehensive text-book of diatom lore. Twenty-eight genera and over 

 200 species are described. Here the author has departed from the usual, com- 

 paratively superficial methods, and has taken into account the form and 

 structure of the protoplast, the position of the nucleus, the number, form, and 

 position of chromatophores, the occurrence of pyrenoids, and finally the complete 

 life history of each species as far as this has been possible. 



The second part of the work, dealing with the structure and development of 

 Diatoms, consists of sfx chapters : 



I. The Diatom Cell. A study of cell characters convinced the author that 

 the number and position of the chromatophores is the most important taxonomic 

 character, and that mere frustule structures are not sufficient for determining the 

 limits of species. II. Cell division. III. Movements of diatoms. The raphe 

 is regarded as the organ of locomotion. IV. An attempt to explain the variety 

 of form of diatoms, by their relation to environmental factors. V. The auxo- 

 spores. VI. The rule of the Diatomaceae in the economy of nature. There is 

 also an extensive bibliography. c. j. c. 



RECENT LITERATURE. 



Biffen, R. H. On the Biology of Agaricus velu- Coniferen. 8vo. 57 pp., pi. i., Warschau, 



tipes. Jour. Linn. Soc. Bot., 34: 147-162, 1899. (In Russian.) 



pis. 2-4, 1899. Slavicek, Fr. J. Zur Kentniss der Keimlinge 



Ward, H. Marshall. Onygena equina, Willd.i zumeist fremdlandischer Coniferen. Ver- 



a Horn-Destroying Fungus. Phil. Trans, of handlungen der Forstwirthe von Mahren u. 



the Roy. Soc. of London, 191 : 269-291, Schlesien. Heft. 2, 47 pp., 1899. 



^ ■ ""' Taylor, L. J. The Scope of Natural Selection. 



West, W. Some Oscillarioideae from the Plank- Nat. Science, 15: 114-129,1899. 



ton. Jour, of Bot. British and Foreign, 37 : 



, __ _g J .QQ 1899. Kuckuck, P. Ueber Polymorphic bei einigen 



„, ' , „, [ ^ ^ ^ , ,,, . , Phasosporeen. Festschrift fiir Schwendener, 



West, W„ and West, G. S. Fresh Water Algae ^^70! i^ i8qq 



of West Indies. Jour. Linn. Soc. Bot., No. ^' •^^'' ^ ' ^' „ 



2i;8 i8qq. Macbrlde, Thomas H. The North American 



' ' . . . Shme Moulds ; being a list of all species of 



West, G. 0. Vanation in the Desmidieae. Myxomycetes hitherto described from North 



Jour. Linn. Soc. Bot., No. 257, pis. 4, 1898. America, including Central America. 8vo., 



Wuiclzkl, C. Ueber die Befruchtung bei den pp. XVII-l-269, 18 pis. Macmillan, 1899. 



