. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . J5C 1000re. Fig. 16.—Globe flask. Fig. 17.—Volumetric flask. Fig. 18.—Erlenmeyer flask. Certain technical methods are employed in the preparation of nearlyall culture media, such as adjustment of reaction, clearing, filtering,etc. These details must be understood before the actual preparationof media is given. CULTURE MEDIA 89 Reaction of Media.—Titration and Adjustment.—A moderately alkaline reac-tion to litmus is satisfactory for the growth of most pathogenic ordinary work the

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. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . J5C 1000re. Fig. 16.—Globe flask. Fig. 17.—Volumetric flask. Fig. 18.—Erlenmeyer flask. Certain technical methods are employed in the preparation of nearlyall culture media, such as adjustment of reaction, clearing, filtering,etc. These details must be understood before the actual preparationof media is given. CULTURE MEDIA 89 Reaction of Media.—Titration and Adjustment.—A moderately alkaline reac-tion to litmus is satisfactory for the growth of most pathogenic ordinary work the usual acid reaction of the mediar in preparation may bereduced by the addition of a 4 per cent, sodium hydrate solution until redlitmus paper is turned slightly but distinctly blue and blue litmus paperremains the same color. Litmus, however, is not a deUcate indicator, and

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