. A laboratory manual of soil bacteriology. Soil microbiology. 150 SOIL BACTERIOLOGY by inclining the end of the pipet into the flask and pouring the wash-water on to the beads. Washing should be re- peated until all traces of alkaU have disappeared. Place a few drops on a watch-glass containing phenolphthalein. If there is no change in color, the washing is complete. V. Fig. 10.—Apparatus for determining carbon dioxid. Avoid using too large a quantity of water for each washing, otherwise the volume of liquid to titrate will be very large. iVo/e.—Carbon-dioxid-free water may be prepared by dra
. A laboratory manual of soil bacteriology. Soil microbiology. 150 SOIL BACTERIOLOGY by inclining the end of the pipet into the flask and pouring the wash-water on to the beads. Washing should be re- peated until all traces of alkaU have disappeared. Place a few drops on a watch-glass containing phenolphthalein. If there is no change in color, the washing is complete. V. Fig. 10.—Apparatus for determining carbon dioxid. Avoid using too large a quantity of water for each washing, otherwise the volume of liquid to titrate will be very large. iVo/e.—Carbon-dioxid-free water may be prepared by drawing a current of carbon-dioxid-free air through distilled water for twenty-four hours or 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 Fred, Edwin Broun, 1887-1981. Philadelphia, London, W. B. Saunders Company
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