1SI Physiologie. — Algae. 



Chez les Prunus Laurocerasus, les feuilles hivernantes mises 

 ä l'obscurite, gardent intactes leur teneur en HCn aussi long- 

 temps qu'elles restant vertes, ce qui peut durer un nombre 

 considerable de jours; des qu'elles commement ä jaunir elles 

 perdent rapidement leur acide prussique. 



L'analyse n'a pas indique de diminution dans les feuilles, 

 apres le bourgeounement des rameaux qui les portent. Reste 

 encore a relever que le liquide obtenu par distillation, sent 

 toujours la benzoldehyde, de sorte qu'il est vraisemblable que 

 les bourgeons comme les jeunes pousses contiennent des gluco- 

 sides du type de l'arnygdaline. Westerdijk (Amsterdam). 



Blackman, F. F. and Tansley, A. G., A revision of the 



Classification of the Green Algae. [Concluded.j 

 The New Phytologist. Vol. I. December 23, 1902. No. 10. 

 p. 238—244.) 



This number continues the enumeration, with diagnoses, of 

 the following: Fam. III: Botrydiaceae, containing genus 

 Botrydium. Series III. Vaucheriales. Fam. 1. Vaucheriaceae, 

 with genera Vaucheria, Dichotomosiphon. Fam. II. Phyllo- 

 siphonaceae, with genera Phyllosiphon, Phytophysa. 



Then follows an addendum, containing genera Brachio- 

 monas, Chroolepus, Dictyocystis, Elakatothrix, Ichthyocercus, 

 Lauterborniella, Pleurothamnion , Roya i, Sphaerocystis and 

 Tetrasporldium. A bibliography completes this paper. 



E. S. Gepp, nee Barton. 



West, W. and West, G. S., A Contribution to the 

 Fresh water algae of the North of Ireland. (The 

 Transactions of the Royal Irish Academv. Vol. XXXII. 

 Section B. Part 1. August 1902. 100 pp." 3 plates.) 



A list of 614 species and 107 varieties and forms, 

 representing 139 genera, collected in Lough Neagh, in 

 Don egal, Co. Down and Co. Louth; certain species from 

 Co. W i c k 1 ow are also included. Critical notes are appended 

 in the case of special interest attaching to any species. About 

 24 new records for the British Isles are given and about 

 12 species uro described as new to science. 



A section of the paper contains remarks on the Plankton 

 Algae of Lough Neagh, and gives an aecount of the method 

 of collecting, as well as a tabulated list of the species found in 

 Lough Neagh in May 1900 and July 1901, together with 

 records from the Upper River Bann and from Lough Bey. 

 Many species, tili now exciusively found in the fresh-water 

 Plankton flora of the Continent, are here recorded from 

 L ti g h N e a g ll. E. S. Gepp, nee Barton. 



