140 ANIMAL ECOLOGY 



tisch-Biologische Studie. Acta Soc. Pro Fauna 

 et Flora Fennica, Vol. XVII, pp. 1-259. 

 A descriptive associational study of a lake fauna, cor- 

 relating the fauna and the vegetation. 

 FORBES, S. A., and RICHARDSON, R. E. 



1909. The Fishes of Illinois. 111. State Nat. Hist. Surv., 



Vol. III. pp. 357. 



Contains numerous observations on the habitats and 

 associations of fish ; a subject hitherto greatly neg- 

 lected. 

 WESENBERG-LUND, C. 



1908. Plankton Investigations of the Danish Lakes. Danish 

 Freshwater Biol. Lab., Op. 5, Part I, pp. 389. 

 Part II, Copenhagen. 



The only fresh-water plankton study known to the 

 writer, which takes up the plankton from a distinctly 

 modern ecological standpoint. An excellent sum- 

 mary of the problems of the fresh-water lake plank- 

 ton. Abundant references to the literature. 

 ALLEE, W. C. 



1912. Seasonal Succession in Old Forest Ponds. Trans. 



111. Acad. Sci., 1911, Vol. IV, pp. 126-131. 

 To determine the complete composition of an animal 

 association observations must cover all seasons of 

 the year. This paper and the following ones will 

 indicate the general character of the seasonal 

 changes. 

 WOOD, J. G. and T. 



1886. The Field Naturalist's Handbook, pp. 167. Fourth 



Edition. London. 



This is a British work. It gives by months the seasonal 

 succession of moths, butterflies, birds, flowering of 

 plants, notes on habitat, etc. 

 FRITSCH, C. 



1850. Resultate dreijahriger Beobachtungen iiber die jahr- 

 liche Vertheilung der Papilioniden. Sitzungsber. 



