66 



movements, seasonal variation of form, inter-relationships, etc., of 

 limnetic organisms, about which we previously knew practically 

 nothing. There seems every reason to hope that similar work carried 

 on with still greater care and for longer periods will help very 

 materially in solving many important biological problems which are 

 at present obscure. The work, however, is tedious, and requires for 

 its proper execution a small staff of specialists working together for 

 at least two or three years at a permanent station by the side of a 

 lake. Such a station, devoted to fresh-water biological research, will 

 no doubt be started some day in this country — probably when it is 

 too late to do more than fill in the details of the broad principles 

 of fresh-water biology now being elucidated by many eminent 

 workers on the Continent and in America. 



The following books and papers will be found useful to any who 

 may be tempted to look into the subject of the scientific investiga- 

 tion of lakes : — 



Apstein, C. — ' Das Siisswasserplankton,' 1896. 



BiRGE, E. A. — "Plankton Studies on Lake Mendota," 'Trans. 

 Wisconsin Academy of Sciences,' etc., vol. x, 1895, ^"^ vol. xi, 



FoREL, F. A. — "Le Leman," 'Monographic Limnologique,' vol. i, 

 1892; vol, ii, 1895; vol. iii, Part I, 1902. 



FoREL, F. A. — " Handbuch der Seenkunde," — " Allgemeine 

 Limnologie," 1901. (The most generally useful work in a small 

 compass on the whole subject.) 



Mill, H. R. — "The English Lakes," 1895. (Reprint of a paper 

 " On the Bathymetrical Survey of the English Lakes," from the 

 ' Geographical Journal' for July and August, 1895.) 



Murray, Sir J., and Pullar, F. P. — " A Bathymetrical Survey 

 of the Fresh-water Lochs of Scotland," ' Geographical Journal,' 

 April, 1900, and March, 1901. 



Ward, H. B. — " Fresh-water Investigations during the Last Five 

 Years." ('Studies from the Zoological Laboratory of the University 

 of Nebraska,' No. 31, June, 1899.) 



Weismann, a. — 'Das Thierleben im Bodensee,' 1877. 



Zacharias, O. — ' Forschungsberichte aus der Biologischen 

 Station zu Plon,' 1893 onwards. 



