An ecological study of prairie An ecological study of prairie and forest invertebrates ecologicalstudyo00adam Year: 1915 Fier. 1. Flowers of the swamp milkweed (Asclepias incarnata) at Station I, d. These were the favoiite haunts of manv flower-visiting insects. (Photograph, T. L. Hankinson.) Fig. 2. Crawfish chimney at Station I, </, Charleston, 111. Probably formed by Cambarusgracilis or aiogenes. (Photograph by T. L. Hankinson.)

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