. Bulletin. Article VI.—Some Recent Changes in Illinois River Biology* ByStephen A. Forbes and Robert Earle Richardson. The principal causes of change in the biological environment of theIllinois River which have come in since 1899 are the opening of the drain-age canal of the Sanitary District of Chicago in January, 1900, a greatincrease in the amount of Chicago sewage emptied into the stream, andan extensive reclamation of the river bottoms for agricultural uses; andit is our present purpose to trace the principal eiTects of these changesupon the life of the stream. Although this study has h
. Bulletin. Article VI.—Some Recent Changes in Illinois River Biology* ByStephen A. Forbes and Robert Earle Richardson. The principal causes of change in the biological environment of theIllinois River which have come in since 1899 are the opening of the drain-age canal of the Sanitary District of Chicago in January, 1900, a greatincrease in the amount of Chicago sewage emptied into the stream, andan extensive reclamation of the river bottoms for agricultural uses; andit is our present purpose to trace the principal eiTects of these changesupon the life of the stream. Although this study has had primarily apurely scientific motive, it has bearings of a practical character which wehave followed out in some cases beyond the boundaries of our properinquiry, with a view to making our results available, or at least suggestive,to those who have to deal with problems of sewage disposal, fisheries,bottom-land agriculture, and the like. The principal changes due to the three causes above mentioned arepr
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
