21 li SUMMARY OF CURRENT RESEARCHES RELATING TO 



polyphyllum, Turlmaria ornata and Ahnfeltia concinna, the latter being 

 in as great profusion as is Funis on British coasts. A table of plankton 

 is iriven. A systematic treatment follows, in which the records are 

 often accompanied by critical notes. Eight new species are described 

 and several new varieties. 



Anonymous — Diatoms at Spurn. 



[Records a collection of 5:? species of diatoms made on the occasion of the 

 recent visit to Spurn of the Yorkshire Naturalists' Union. An abundance 

 was found of Actinocyclus Boperii, and three species new to the Hull 

 district are recorded.] Naturalixt, 1904, pp. 37f>-80. 



Artari, A. — Der Einfluss der Konzentration der Nahrlosungen auf die Entwicke- 

 lnng einiger griiner Algen. (The influence of concentration of nutritive solutions- 

 on the development of certain green Algae.) 



Pringsheim Jahrb. Wiss. Bot., xi. (1904) pp. 593-613. 



Beijerinck, M. W.— Chlorella variegata, ein hunter Mikrobe. (Ch. variegata. a 



coloured microbe.) Bee. Trav. Bot. Neerland Y 



i. (1904) pp. 14-28. 



Das Assimilationsprodukt der Kohlensaure in den Chromato- 

 phoren der Diatomeen. (The assimilation product of 

 carbonic acid in the chroma tophores of diatoms.) 



Tom. cit., pp. 28-33. 



Borgesen, F.— 0m Faerbernes Algevegetation. Et Gensvar. I. (On the algid 

 vegetation of the Faeroes.) 



[A detailed and searching criticism on the paper of Messrs. Porsild and 

 Simmons on this subject in a previous number of the same journal (p. 149)] 



Botan. Notiser., 1904, pp. 245-74. 



Brehm, V., & F. Zederbauer. — Beitrage zur Planktonuntersuchung Alpiner 

 Seen. (Contributiona to our knowledge of the plankton of Alpine lakes.) 



[Describes the results of an investigation of Lakes Garda, Loppio. and Cal- 

 donazzo. The plankton is largely zoological. In the last-named lake, 

 however, Oscillaria rubescens occurred in such masses as had only been seen 

 by the authors in the Lake of Zell.] 



Verh. K. E. Zool. Bot. Gesell. Wien. liv. (1904) pp. 635-43. 



Collins, F. S. — Algae of the Flume. 



[An account of over a dozen algae encrusting the walls of a damp, deep, and 

 narrow ravine in New Hampshire.] Bhodora, vi. (1904) pp. 229-31. 



Da vies, J. H.— A rare Alga in the Upper Bann. 



[Specimens of Cladophora tsgagropila were observed last July growing in 

 situ, as large flat patches submerged and imbedded in the sandy debris of 

 the River Bann at Knochnagor, co. Down.] 



Irish Naturalist, xiv. (1905) p. 30. 



D a v i s, B. M. — The Sexual Organs and Sporophyte Generation of the Rhodophyceae. 

 [Treats of Nemaliou.] Bot. Gazette, xxxix. (1905) pp. 64-6. 



G a i d u K o w, N. — TJeber den Einflussfarbigen Lichtes auf die Farbung der Oscillarien 

 (On the influence of coloured light on the, coloration of the Oscillarise.) 



Script. Hort. bot. Univ. Petrop., xxii. (9 pis.). 



G E R a ssi mo w, J. J.— Atherkulturen von Spirogyra. (Ether cultures of Spirogyra.) 



[Describes the swelling of cells which contain a 

 nucleus, caused by the ether; the cells and the 

 chambers which have not a nucleus are not 

 affected by the ether. The author therefore con- 

 cludes that the ether acts on the nucleus itself, 

 exciting it to activity, the result being the swell- 

 ing of the cell-wall surrounding it.] 



Flora, xciv. (1905) pp. 79-85 (7 tables). 



