446 Proceedings of Royal Society of Edinburgh. [sess. 
end of the more elongated lakes we generally find more or less 
extensive marshy ground. Many of our existing lakes are 
apparently doomed, and it is difficult to imagine how in our 
country new lakes could he formed. 
There can he little doubt that in Scotland the coast-lines of the 
lakes have altered very little during thousands of years, and that 
the lakes themselves will remain through long ages. 
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1902. Brehm, V., “ Zusammensetzung, Yerteilung und Periodi- 
citat des Zooplankton im Achensee,” Zeitschr. d. Ferdinandeums, 
Bd. 46, p. 1. 
1904. Ekman, S., “Die Phyllopoden, Cladoceren und frei- 
lebenden Copepoden der nord-schwedischen Hochgebirge,” Zool. 
Jahrb ., Bd. 21, Abth. Syst., p. 1. 
1892-1902. Forel, F. A., “ Le Leman,” Monographic limno- 
logique , t. 1-3, Lausanne. 
1901. Forel, F. A., “Etude thermique des lacs du Nord de 
l’Europe,” Arch, des sci. phys. et natur ., ser. 4, t. 12, p. 35. 
1901. Geikie, A., The Scenery of Scotland. London. 
1901. Halbfass, W., “ Beitrage zur Kenntniss der Pommerschen 
Seen,” Petermann’s Mitteilungen, Erganzungsheft Nr. 136, Gotha. 
1903. Holmboe, J., “ Planterester i norske torvmyrer,” Videns- 
kab. Selsk. Skrifier Christiania , 1903, Math, naturv. Klasse, 
No. 2. 
1896. Kirchner, D., in Schroter und Kirchner, “Die Vegeta- 
tion des Bodensees,” Schriften d. Vereins fur Geschichte des 
Bodensees und seiner Umgebung , Lindau, I. 1896, II. 1902. 
1900. Murray, Sir John, and Pullar, F. P., “A Bathymetrical 
Survey of the Fresh-water Lochs of Scotland,” Part I., Geogr. 
Journ ., vol. xv. p. 309. 
1901a. Murray, Sir John, and Pullar, F. P., ibid., Part II., 
ibid., vol. xvii. p. 273. 
1901b. Murray, Sir John, and Pullar, F. P., ibid., Part III., 
No. 1. ibid., p. 289. 
