. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. CHICAGO AND VTCINITT. 33 In closing the section on rivers, all that is needed is to emphasize again the idea that the life history of a river shows retrogression at many points, but that the progressions outnumber the retrogressions. Not only this, but retrogressive phases are relatively ephemeral. Thus a river system, viewed as a whole, is progressive, and through all its. Fig. is.âFlood plain of Thorn creek near Glenwood, showing a meadow instead of a forest. At the center is an uneroded island, detached from t
. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. CHICAGO AND VTCINITT. 33 In closing the section on rivers, all that is needed is to emphasize again the idea that the life history of a river shows retrogression at many points, but that the progressions outnumber the retrogressions. Not only this, but retrogressive phases are relatively ephemeral. Thus a river system, viewed as a whole, is progressive, and through all its. Fig. is.âFlood plain of Thorn creek near Glenwood, showing a meadow instead of a forest. At the center is an uneroded island, detached from the morainic mainland, seen at the left. The vegetation of the island is similar to that of the morainic upland. vicissitudes there is an ever-increasing area of mesophytic forest. When the theoretical base level is reached, there seems to be no apparent reason why mesophytic forests should not be developed throughout most of the great plain. 2. THE POND-SWAMP-PRAIRIE SERIES A. The pond.âThere are all gradations between rapid streams and completely undrained ponds, and corresponding with these various â¢gradations are characteristic plant species. It will be convenient to â subdivide the series under discussion into two parts, the first dealing with undrained ponds and swamps, the second with half-drained ponds and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cowles, Henry Chandler, 1869-1939. Chicago, The Geographic Society of Chicago
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
