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Special Preservative Against and decolorizing

included general receipts for bleaching Infection. In a lecture delivered in the for special purposes, such as bleaching fabrics The methods employed Royal Institution, Professor Tyndall proved, for dyeing, removing stains, &c., will be found by a series of interesting experiments, that the in their proper places by reference to the insurest filter in a contagious atmosphere is dex. cotton wool. "If a physician," said the Pro- 1715. To Bleach Cotton Pure White. lungs Boil for 3 hours in water containing 1 gill of his patient, or from his own, which contagious disease is said to be propa- tic soda; wash well from the lyc, then lay own, the germs by to the gallon of either caustic potassa or causgated, he will employ a cotton wool respirator. the yarn or fabric to steep for 4 or 5 hours in In the crowded dwellings of the London poor , cold water containing 1 pint of bleaching where the isolation of the sick is difficult, if liquor (see No. 104) to the gallon; then lift not impossible, the noxious air around the out and steep for an hour in a sour of 1 winepatient may by this simple means be restored glassful of sulphuric acid to the gallon of to practical purity. Thus filtered, attendants water; lift, and wash well; then boil for 2 it is ex- hours in a caustic lye, half the strength of the ceedingly probable that the germs which first; wash from this, and steep again for 4 , at their hours in the bleaching liquor; wash from this leisure, can work their way across the mucous and steep again for 1 hour in a clean sour, membrane, are those which sow in the body made in the same manner as the first; wash epidemic disease. If this be so, such disease well from this, and dry. A little smalt blue may be warded off by fitters of cotton wool." is put into the last washing water to clear