Wood's Medical and Surgical Monographs . atin upon the very spot of the experiment; itis sufficient for this purpose to heat it by means of the alcohollamp represented in the figure, above which are placed theconical flasks. The upper story of the box contains two diluting-vesselseach capable of holding five hundred grams of sterilized water,two vessels of fifty grams capacity, and finally two Freuden-reich flasks holding 10 ; at the side of these vessels areplaced the alcohol lamp and the flask intended to contain thisinflammable liquid. In a rack placed at the farthest wall of the box ar
Wood's Medical and Surgical Monographs . atin upon the very spot of the experiment; itis sufficient for this purpose to heat it by means of the alcohollamp represented in the figure, above which are placed theconical flasks. The upper story of the box contains two diluting-vesselseach capable of holding five hundred grams of sterilized water,two vessels of fifty grams capacity, and finally two Freuden-reich flasks holding 10 ; at the side of these vessels areplaced the alcohol lamp and the flask intended to contain thisinflammable liquid. In a rack placed at the farthest wall of the box are placedtest-tubes, graduated and sterilized pipettes, and pipettes forfractional dilution, all sterilized. This summary mention will be sufficient for those who Bacteriological Analysis of Water. 459 have read attentively the few pages given to the descriptionof the apparatus used for the analysis of water by the mixedprocess. This case also contains some flasks, some platesreserved for qualitative analysis, and a special little vessel. Fig. 17.—Case for the Bacteriological Analysis of Water. Made by the firm of Alvergniat. with movable, tapering- cover provided with two openings, asort of spherical pipette, which serves to gather the water tobe analysed and to convey it to the laboratory in order tomake the final analyses whenever convenient. CHAPTER lY. QUALITATIVE ANALYSIS. I. General Considerations upon the Methods ofInvestigation. Many operators believe their task well advanced, if notterminated, when, after all the mechanical operations of inoc-ulation and enumeration, the3^ have succeeded in determining-the number of microbes to the cubic centimetre capable ofbeing developed upon a gelatin plate; statistically this figureis not absolute, as I have taken pains to show, for it does nottake account of the numerous bacteria which may developabove 22° C. nor of those which never grow in the almostneutral nutritive jelly used in bacteriological laboratories. If these same
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