58 Physiologie. — Algae. 



constituents of the Solution is also changing. To reduce the errors 

 arising from these sources, seeds were used of as pure a strain as 

 could be obtained and seedlings as much alike as possible were 

 selected; all the cultures in a series were started on the same day 

 and also harvested and dried at the same time, to make the results 

 strictly comparable; each plant was dried and weighed separateh' 

 and the probable error of the mean of each set of 10 results calcu- 

 lated in order to gain an idea of the significance of any differences 

 in dry weight. From his results with rye and barley the author 

 concludes that the Variation over a fairly wide ränge of concentra- 

 tion of nutrient Solution produces relatively little effect on the 

 amount of dry matter produced, though below a certain concentra- 

 tion there appears to be a definite falling off in rate of growth; 

 the concentration of the soil Solution as estimated by Camer on, 

 low as it is, is yet high enough to produce healthy plants; frequent 

 changing of the Solution produces decidedly better growth; it is 

 necessary to calculate the probable error of results obtained with 

 water cultures in order to determine the significance of differences 

 between results from different sets of cultures. F. Cavers. 



Bailey, L. W., The Diatoms of New Brunswick and Prince 

 Edward Island. (Proc. Trans. Roy. Soc. Canada. Third series. 

 VII. 4. 1913. p. 57—76. Ottawa 1914.) 



The author refers to the scarcity of papers on Canadian diatoms, 

 gives a sketch of the physical conditions chacterising the region 

 in which his collections were made, shows in a classified list the 

 forms which so far have been observed, adds critical notes on the 

 more important genera, and draws some general conclusions from 

 the facts recorded, concerning 1) the remarkable richness of the 

 diatom flora about the New Brunswick coast; 2) the remarkable 

 commingling of freshwater and saltwater species; 3) the character 

 of the plankton; 4) the relations of the Diatoms to each other and 

 to other forms of life; 5) contrasts between the Diatom flora of the 

 Bay of Fundy and Gulf of St. Lawrence; 6) geographical distri- 

 bution; 7) generic and specific distinctions. He is of opinion that 

 there has been to much species-splitting upon trivial grounds, Cos- 

 cmoätscus Baüeyana Mackay is a new species. 



Ethel S. Gepp. 



Beauchamp, P. de, Apergu sur la repartition des €tres 

 dans la zone des marees ä Roseoff. CBull. Soc. zool. France. 

 XXXIX. 3. p. 29—43. 1914.) 



De Beauchamp donne la caracteristique algologique des zones 

 de maree de Roseoff. 



La zone I s'etend depuis le niveau moyen des hautes mers de 

 syzygic jusqu'au debut des Fucacees. 



La zone II, lä ou le revetement de Fucacees est continu ne 

 renferme qu'un tres petit nombre d'esp^ces sessiles telles que le 

 Cladophora rupestris. On y rencontre cncore le Rhndavia Inillosa , le 

 Nevnalion luhricuni, le Porphyra laciniata. 



La zone III comprend typiquement les Fuchs serratiis et V Hi- 

 manthalia. Ce dernier peut manquer et etre supplee par le Biftir- 

 caria tuherculatn . Les Laminaires peuvent rencontrer jusque dans la 

 partie inferieure de cette zone qui est caract^risee par le röle que 



