1899. The Efficiency of Some Protective Adaptations in Securing Insects from Birds. Amer. Nat., Vol. XXXIII, pp. 461-484.
1902. The Birds of a Maryland Farm. U. S. Dept. Agr., Div. Biol. Surv., Bull. No. 17. pp. 116.
A study in applied ecology. One of the best detailed studies of the birds of a small tract of land and their ecological relations.
Stahl, E.
1888. Pflanzen und Schnecken. Biologische Studie über die Schutzmittel der Pflanzen gegen Schneckenfrass. Jena. Zeitschr. für Naturwiss. herausgegeben von der med.-naturwiss. Gesell. zu Jena, Bd. XXII, pp. 557-684.
A study of the means by which plants are protected(?) from snails and slugs. Numerous feeding experiments.
Dahl, F.
1908. Die Lycosiden oder Wolfspinnen Deutschlands und ihre Stellung im Haushalte der Natur. Nova Acta der Ksl. Leop.-Carol.-Deutschen Akad. der Naturf., Bd. LXXXVII, pp. 175-678. Halle.
Not seen by writer. Mr. J. H. Emerton writes that this paper “gives tables of comparative collecting in all kinds of country.”
Pierce, W. D., Cushman, R. A., and Hood, C. E.