id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
inhs-291	Richardson, R. E.	The Bottom Fauna of the Middle Illinois River, 1913-1925: Its Distribution, Abundance, Valuation, and Index Value in the Study of Stream Pollution	1928	90	.pdf	application/pdf	33558	1237	59	In the summer of 1914, when the small bottom fauna and the fish fauna of the central portion of the Illinois River, between the head of Upper Peoria Lake and the Lagrange Dam, were both in all their larger features for practical purposes normal, the population of the City of Chicago, more than l4o miles above the head of Peoria Lake, was estimated as 2,437,526, and the population equivalent of the wastes from animals slaughtered at the Chicago Stock Yards was approximately 869,000 persons additional. In 1915, Spltacriidac occurred in numbers large enough to atfect valu- ations importantly in only three of the eight sections here recognized ; viz., in Upper Peoria Lake, where they made up 43 per cent of the total on the average; in the first section below Peoria Lake (Peoria and Pekin Union Railwav bridge to Pekin) where they contributed 31 per cent; and in the rich Liver]iool-to-Havana section, where the percentage was also 31.	cache/inhs-291.pdf	txt/inhs-291.txt