. Biological series. Biology. Clemens: Ecological Study of Chirotenetes 9 numbers toward the mouth, disappearing when the slack water is reached. Chemical Analyses of the Water.—In order to obtain definite knowledge concerning the medium in which the nymphs live, chemical analyses were made at various times from December i, 1914, to August 10, 1915. The results are given in tabular form. Comparison with analyses of the water of the neighbouring Fall Creek shows a very close correspondence. The amount of pollution is not excessive as in- dicated by the nitrogen determinations as free and albumi
. Biological series. Biology. Clemens: Ecological Study of Chirotenetes 9 numbers toward the mouth, disappearing when the slack water is reached. Chemical Analyses of the Water.—In order to obtain definite knowledge concerning the medium in which the nymphs live, chemical analyses were made at various times from December i, 1914, to August 10, 1915. The results are given in tabular form. Comparison with analyses of the water of the neighbouring Fall Creek shows a very close correspondence. The amount of pollution is not excessive as in- dicated by the nitrogen determinations as free and albuminoid ammonia, nitrites, nitrates, oxygen consumed, chlorine and alkalinity. The oxygen content is high throughout the 20 9 29 t8 Tea. to 30 MCH. 19 9 19 IS 6 Xa 11 fiPR, Mfiy JUHC Jui-y AUG. Fig. 2.—Relation of the oxygen content to temperatures of Cascadilla Creek. = oxygen in parts per million at 760 mm. pressure. = temperature. doubtless as a result of the turbulent nature of the creek. Figure 5 shows the amounts of oxygen present reduced to 760 mm. pressure as compared with the amounts of saturation at the same temperatures and pressures. The carbon dioxide content is low, probably for the same reason that the oxygen content is high. Temperatures.—Records of the temperatures of the water in Cascadilla Creek were taken almost daily for over a year for the purpose of obtaining information regarding the fluctuation in temperature from day to day, the maximum. 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 University of Toronto; Toronto, Ont. University. University of Toronto studies. Biological series. Toronto University Press [etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1898
