60 ANIMAL ECOLOGY 



who wishes to develop the genetic system of classi- 

 fication. Ultimately we must, of course, develop 

 the latter system. 

 1904. Kurze Anleitung zum wissenschaftlichen Sammeln und 



zum Conservieren von Thieren. pp. 59. Jena. 

 An enlarged edition of the preceding paper. 



DAVENPORT, C. B. 



1904. Statistical Variation with Special Reference to Bio- 



logical Variation. Second, Revised Edition, pp.223. 

 New York. 



FORBES, S. A. 



1907. An Ornithological Cross-Section of Illinois in Autumn. 



Bull. 111. State Lab. Nat. His., Vol. VII, pp. 305- 

 335. 



1908. The Mid-Summer Bird Life of Illinois : A Statistical 



Study. Amer. Nat., Vol. XLII, pp. 505-519. 



GIBSON, W. H. 



1905. Camp Life in the Woods and the Tricks of Trapping 



and Trap Making, pp. 300. New York. 

 A book for boys, but not without value to the older 

 student of live animals. 



FLAHAULT, C., and SCHROTER, C. 



1910. Phytogeographical Nomenclature. Reports and Prop- 

 ositions, IIP Cong. Inter, de Bot. 1910. Bru- 

 xelles. pp. 28. Zurich. 



A very valuable discussion of ecological nomenclature 

 for plants. Defines the use of such terms as biology, 

 ecology, habitat, association, formation, etc. It is 

 very desirable that the plant and animal ecologists 

 cooperate as much as possible in this subject. 



HENSEN, V. 



1887. Ueber die Bestimmung des Plankton's oder des in 

 Meere treibenden Materials an Pflanzen und Thieren ; 

 nebst Anhang. Fiinfter Ber. der Komm. zur 

 wissensch. Untersuch. d. deutschen Meere in Kiel 



