Engineering and Contracting . 4 .23 — .0032 .51 — .0120 .64 .0002 .17 — .0012 .45 — rtSSO .29 — sumcd in this way remains in the water and hence the amount of CO, in surfacewaters sustaining fish life must he influencedto a considerable extent by the fish present. was due to bicai i. In the experimentsthe green growths were largely and smaller numbers of one experiment an aquarium was filled with 174 Engineering and Contracting Vol. XLI. No. 5. tap water and seeded with green dissolved
Engineering and Contracting . 4 .23 — .0032 .51 — .0120 .64 .0002 .17 — .0012 .45 — rtSSO .29 — sumcd in this way remains in the water and hence the amount of CO, in surfacewaters sustaining fish life must he influencedto a considerable extent by the fish present. was due to bicai i. In the experimentsthe green growths were largely and smaller numbers of one experiment an aquarium was filled with 174 Engineering and Contracting Vol. XLI. No. 5. tap water and seeded with green dissolved and at the startwere and part per 100,000, respect-ively. At the end of seven days they and parts pere , respectively. In another experiment a small fish was putinto a tightly stoppered gallon bottle full ofwater containing these green growths. had not been liberated by the organ-isms during this experiment the pri-iii;iril\ fresent would have been consumed b.\. Fig. 1. View Showing Use of Steam-Driven Jackhamer Drill in Sewer Trench in Rock at New Britian, Conn. the fih in -i^ hours. However, it lived eigindays, and at its death at the end of this periorldissolved oxygen was present in the water ingreater volume than at the beginning of theexperiment. The growth of organisms in-creased greatly during this period, and eitherthe presence of these organisms or some bodyformed during their growth or decay was in-jurious to the fish. In a similar experiment, made during cloudvweather when the power ofthe organisms was lowered, the fish presentconsumed the dissolved in four days. In further experiments, not yet completed,upon the effect of such green growths onsewage, bottles of sewage were seeded withorganisms, then aerated for 24 hours andafterwards allowed to stand 24 hours withoutaeration. The average of 16 dissolved oxygendeterminations then made showed partper 100,000 of dissolved
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