Wood's Medical and Surgical Monographs . toitself is filled, at the end of a short time, not only with a verylarge number of bacteria, but with soluble products whichmay give to it poisonous qualities. The result of my re-searches is well calculated to proscribe, in cities where thisstill exists, the storing of spring water in reservoirs, generallymetallic, Avhere it is sometimes kept for a long time beforebeing used. Microscopically Barren Water.—I give this name to awater incapable of nourishing bacteria. In order to prepare this water in considerable quantity, Iuse the apparatus represented
Wood's Medical and Surgical Monographs . toitself is filled, at the end of a short time, not only with a verylarge number of bacteria, but with soluble products whichmay give to it poisonous qualities. The result of my re-searches is well calculated to proscribe, in cities where thisstill exists, the storing of spring water in reservoirs, generallymetallic, Avhere it is sometimes kept for a long time beforebeing used. Microscopically Barren Water.—I give this name to awater incapable of nourishing bacteria. In order to prepare this water in considerable quantity, Iuse the apparatus represented by Fig. 22; it is composed of abell-jar, tubulated at its upper part and laterall3^ Into theypper opening is fastened a flask B, in which circulates a cur-rent of cold water, in order to effect a condensation of dew inthe lower part of the flask. Below this condensing apparatusis placed a receiving flask F, placed at the centre of a crys-tallisoir with a double concentric wall W; and through the Bacteriological Analysis of Water. 505. Fig. i32.—Apparatus fobDistilling of Water at aLow Temperature. funnel E of the lateral opening into the bell-jar ordinary dis-tilled water is conducted passing into the annular part of thiscrystallisoir. The bell-jar arranged upon a movable plate,slightl}^ vaselined, is placed on a stove at30° to 35° C. The water of the annular part of thecrystallisoir is successively led into thecondensing apparatus B, and thence intothe flask F, which at the close of theoperation is covered with the movablestopper C. At the end of some weeks, the flask isfull of water distilled at low temperature,sheltered from atmospheric dust and ac-cidental impurities which occur in waterdistilled by means of the ordinary stills. This water, freefrom atmospheric dust, contains as a solid foreign element,only the silicates: this it derives from the glass; it containsalso the gaseous elements of the atmosphere, ammonia andcarbonic acid from the air. This water is barren
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyork, bookyear18
