. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . mmp-^^r:^ Fig. 19.—Type of bottlecommonly used for dilutions,etc., or as substitutes forflasks. Fig. 20.—Blake on its flat side it givesa large surface of broth oragar. Fig. 21.—Petri dish. Com-monest size is 10 indiameter. phenolphthalein is generally used, giving us more accurate knowledge of thereaction. The neutral points of the two indicators are different, so that mediawhich are alkaline to litmus are still acid to phenolphthalein. The materialsnecessary for titration and adj
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . mmp-^^r:^ Fig. 19.—Type of bottlecommonly used for dilutions,etc., or as substitutes forflasks. Fig. 20.—Blake on its flat side it givesa large surface of broth oragar. Fig. 21.—Petri dish. Com-monest size is 10 indiameter. phenolphthalein is generally used, giving us more accurate knowledge of thereaction. The neutral points of the two indicators are different, so that mediawhich are alkaline to litmus are still acid to phenolphthalein. The materialsnecessary for titration and adjustments of the reaction to phenolphthalein arenormal and twentieth normal solutions of sodium hydrate and of hydrochloricacid, a per cent, solution of phenolphthalein in 50 per cent, alcohol, burettes,casserole, and stirring rod.
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