. Journal of the New England Water Works Association . decrease in the organic JACKSON. 25 nitrogen and slight changes in oxygen consumed, suspended solids, chlorine,and alkalinity. Comparing analyses of the copper, iron, and steel and the rubberwastes with the river water, it is noticeable that while the free ammonia inwaste waters from the rubber industry was as high as and or-ganic nitrogen , in the river below they were only In the waste waters from the iron and steel, oxygenconsumed ran as high as 3 750 total solids 71 000 ,
. Journal of the New England Water Works Association . decrease in the organic JACKSON. 25 nitrogen and slight changes in oxygen consumed, suspended solids, chlorine,and alkalinity. Comparing analyses of the copper, iron, and steel and the rubberwastes with the river water, it is noticeable that while the free ammonia inwaste waters from the rubber industry was as high as and or-ganic nitrogen , in the river below they were only In the waste waters from the iron and steel, oxygenconsumed ran as high as 3 750 total solids 71 000 , chlorine5 000 , alkalinity 83 000, iron 1300 , acidity 20 500 ;while in the river, taking them in the same order, the highest figures 309 , ,and 17 Even in the Mad Riverthe acidity never exceeded 23 The explanation for this would appear to be the effect of dilution whenmixed with waters of the Naugatuck and the opportunity afforded forsedimentation by the numerous mill ponds. HAKrropD. HOCKAHOM RiVER MAP Of WTERMi) Unfortunately, full mineral analyses of the Eockanum River are no1available, but Table 4 gives results of sanitary analyses for the period fromJuly 1918, to July 1919. No. 1 is at Lake Schenipsit. No. 2 is below Rockville. No. 8 is above Manchester. No. 4 is at Burnside, below the en1 ranee of the South Branch, on whichare located large silk mills and paper companies. No. 5 is analyses of rain water, collected :it the Yale Medical School,New Haven, during L889 L890. The quality of water Buitable for use in 26 POLLUTION OF STREAMS. the woolen and paper industries is often described as that akin to rainwater, and this is introduced here for comparison with water from LakeSchenipsit, which is considered satisfactory. TABLE 4. a ?g M B 2 || y o2 U H-i o >> 8 M < 3 si .5 = 0 a<< V Z No. 1. 92 15 Minimum. 23 9 Mean 47 13 No. 2. Ma
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