Algae. — Fungi, Bacteria und Pathologie. 523 



^EST, W. a n d West, G. S., Scottish Freshwatcr Plank- 

 ton. No. 1. (Journ. of the Linnean Soc. Vol. XXXV. 

 Botany. No. 247. p. 519—556. plates 14—18.) 



This paper is divided into four parts. The first is an introdncüon, 

 in which the authors deal with the small amount of literature aiready 

 existing on the subject of British Fresh water Plankton, and add 

 remarks on the present collection and the method of obtaining it. Section II 

 is a detailed account of the Plankton of the locks investigated. The 

 results are presented in the form of tables, one shewing the species col- 

 lected in eleven locks during summer and antumm and another ireating of a 

 few smal! collections made in the South of Scotland during the spring. 

 A Short geographica! description is given of each lock and notes on cer- 

 tain animal forms collected among the plant plankton. §ektion II!. Con- 

 sists of a systematic account of the most interesting species in the pre- 

 ceeding Plänkton Collection, this is alniost entirely concerned with 

 Desmids, among which the following new species are described: Geni- 

 cularla elegans, Micrasterias mnrrayi^ Arthrodesiniis crassiis, A. quiri- 

 feriis, Stanrastriim conspicunm and 5. pseudopelagicum, as well as new 

 varieties to aiready existing species. An interesting record is Stanras- 

 triim verticillatuni Archer, no figure of which has hitherto been publi- 

 shed, since the so-called figure of it in Cooke's British Desmids 

 18S6, tab. 61, fig. 3 does not represent this species. Sektion IV. gives 

 the conclusions of the authors. They find that the Scottish plankton 

 differs considerably from that of the western parts of Continental Eu ro p e. 

 It is unique in the abundance of its Desmids, of which the most con- 

 spicuous are of a type confined almost exclusively to the extreme western 

 and north-western shore-districts of Europe and N. America. The 

 commonest and most abundant species are invariably of the genus 

 Staurastram, principally 6". ophiura, S. Arctiscon and 5". grande. There 

 is a remarkable scarcity of free-swimming Protococcoideae. The most 

 striking and characteristic Diatoms are Asterionella gracillima, Tabel- 

 laria fenesfrata var. asterionclloides, and forms of Surirella robusta The 

 majority of the species of Stanrastriim and Arthrodesmns are remar- 

 kable for their long spines or long processes with spinate apices, indeed 

 an excessive development of spines is noticeable throughout the plank- 

 ton. The species are more numerous in late summer and autumn than 

 in spring. E. S. Gepp (nee Barton). 



Bjelaeff, Ueber einige biochemische Eigenschaften 



der Colibazillengruppe. (Centralblatt für Bakteriologie 



etc. I. Abtheil. Bd. XXXIII. 1903. p. 513.) 



Nach Bjelaeff's Untersuchungen erzeugen Bacillus bremensis 

 febris gastricae, B. paratyphi Schottmülleri, B. enteritidis Gaertneri 

 und B. dysenteriae in gleicher Weise wie B. typhi und B. coli aus 

 Glukose optisch aktive Milchsäuren, die gleiche Art stets die gleiche 

 Säure; die beiden als i?. /^arß/j'/?/// beschriebenen Arten unterscheiden 

 sich auch hierin. Der Peptongehalt des Mediums ist von Einfluss auf 

 die optischen Eigenschaften der entstehenden Milchsäure; die von 

 B. coli ist stets linksdrehend. Die optisch aktive Säure ist nie rein, 

 sondern stets mit inaktiver gemischt. Die genannten Bakterien und 

 einige andere gaben sämmtlich im geeigneten Nährmedium Indolreaktion, 

 doch schwächer als B. coli; mit Pepton von anderer Herkunft erzeugte 

 nur dieser Indol. Hugo Fischer (Bonn). 



BOKORNY, Th., lieber die Wirkung des Schwefelkohlen- 

 stoffes auf Pflanzen. (Forstwissenschaft!. Centralblatt. 

 Bd. XXIV. 1902. p. 616.) 



Verf. erbringt den Nachweis, dass Schwefelkohlenstoff, der zur Be- 

 kämpfung forstlicher Schädlinge vorgeschlagen worden ist, auch auf die 



