Contains numerous observations on the habitats and associations of fish; a subject hitherto greatly neglected.

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 summary of the problems of the fresh-water lake plankton. Abundant references to the literature.

Allee, W. C.

1912. Seasonal Succession in Old Forest Ponds. Trans. Ill. 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.