1915] 
Cahn: Ecology of Wingra Springs Region 
173 
(14) It is rather surprising to note the great variety of vertebrates 
found in so small an area, namely, two hundred and five species, and there 
is every evidence of a keen competition resulting in the survival of the fit- 
test of each species. 
XI. BIBLIOGRAPHY 
(1) Adams, C. C., An Ecological Survey of Isle Royal, Lake Superior- 
Ann. Rept. Mich. Geol. Surv. 1909. 
(2) Adams, C. C. The Ecological Succession of Birds. Ann. Rept. Mich. 
Geol. Surv., 1909. 
(3) Adams, C. C. Guide to the study of Animal Ecology. MacMillan, 
1913. 
(4) Allen, A. A. The Red-winged Blackbird; A study in the Ecology 
of a Cat-tail Marsh. Abst. of Proc. Linn. Soc. of N. Y., Nos. 
24-25, pp. 41-128. 
(5) Burns, F. L. A Sectional Bird Census. Wilson Bull. N. S. Vol. 
VIII, pp. 84-103, 1901. 
(6) Cahn, A. R. Notes on a Captive Virginia Rail. Auk, Vol. XXXII, 
No. 1, Jan., p. 91, 1915. 
(7) Cahn, A. R. The Status of Harris’s Sparrow in Wisconsin and 
Neighboring States. Bull. Wis. Nat. Hist. Soc., Vol. XIII, 
No. 2, June, 1915. 
(8) Eaton, E. H. The Birds of New York. Mem. 12, N. Y. State Mus., 
Vol. 2, pp. 5-50. 
(9) Forbes, S. A. Ichthyology of Illinois. State Lab. Nat. Hist. 
(no date). 
(10) Forbes, S. A. An Ornithological Cross section of Illinois in Autumn. 
Bull. III. State Lab. Nat. Hist., Vol. VII, pp. 305-335, 1908. 
(11) Forbes, S. A. The Mid-summer Bird Life of Illinois: A Statistical 
Study. Amer. Nat. Vol. XLII, p. 505, 1908. 
(12) Gates, F. C. Summer-bird Life in the Vicinity of Havana, Illinois, 
in its Relation to the Prominent Plant Associations. Wils. 
Bull., Vol. XXIII, pp. 1-27, 1911. 
(13) Hankinson, T. L. A Biological Survey of Walnut Lake, Michigan. 
Geol. Surv. Mich., pp. 161-288, 1907. 
(14) McCreary, O. Ecological Distribution of Birds of Isle Royale, 
Lake Superior. Mich. Geol. Surv., 1909. 
(15) Muttkowski, R. A. Review of the Dragon-flies of Wisconsin. 
Bull. Wis. Nat. Hist. Soc., Vol. VI, Nos. 1-2, pp. 57-128, 1908. 
(16) Pe^rse, A. S. On the Food of the Small Shore Fishes in .the Waters 
Near Madison, Wisconsin. Bull. Wis. Nat. Hist. Soc., Vol. 
XIII, No. 1, pp. 7-21, 1915. 
(17) Ruthven, A. G. Herpetology of Michigan. Mich. Geol. and Bilo. 
Surv., Pub. 10, Biol. Series 3, 1912. 
(18) Schorger, A. W. Blue-gray Gnatcatcher Nesting in Wisconsin. 
Auk, XXXII, No. 1, Jan. 1915, p. 106. 
