The microscopy of vegetable foods : with special reference to the detection of adulteration and the diagnosis of mixtures / by Andrew L. Winton ... with the collaboration of Dr. Josef Moeller ... with 589 illustrations.

  • Winton, Andrew Lincoln, 1864-1946.
Date:
1906
Catalogue details

Licence: Public Domain Mark

Credit: The microscopy of vegetable foods : with special reference to the detection of adulteration and the diagnosis of mixtures / by Andrew L. Winton ... with the collaboration of Dr. Josef Moeller ... with 589 illustrations. Source: Wellcome Collection.

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    9 Glycerine. For use as a mounting medium, dilute with an equal volume of water. Glycerine Jelly (Kaiser’s). Soak i part of finest French gelatine 2 hours in 6 parts of distilled water. Add 7 parts of glycerine, and to each 100 grams of the mixture, 1 gram of strongest carbolic acid. Warm for 10 to 15 minutes with constant stirring, until the flakes from the car¬ bolic acid disappear. Filter through previously moistened glass wool. Warm as needed, and remove with a glass rod. Glycerine jelly is sold by all dealers. Glycerine Gum. Dissolve 10 grams of gum arabic and 2 grams of glycerine in 10 cc. of water. Hydrochloric Acid, Concentrated. Iodine in Potassium Iodide. Dissolve 0.05 gram of iodine and 0.2 gram of potassium iodide in 15 cc. of water. Iodine Tincture. Dissolve in 95 per cent alcohol sufficient iodine to make a light coffee-colored solution. All iodine solutions deteriorate on keeping, particularly if exposed to the light. Laban aquT s Solution (chlorinated soda). Thoroughly triturate 75 grams of fresh chlorinated lime (bleaching-powder) with 600 cc. of water, added in two or three successive portions, and filter. To the filtrate add a solution of 150 grams of crystallized sodium carbonate in 400 cc. of water, mix thoroughly, warm if the solution gelatinizes, and again filter. The solution gradually loses strength on standing, and should be kept in stoppered bottles in a cool, dark place. Javelle Water (chlorinated potash) may be prepared in the same manner, substituting 58 grams of potassium carbonate for the sodium carbonate. This reagent is used for the same purpose as Labarraque’s solution. Millon's Reagent. Dissolve metallic mercury in an equal weight of concentrated nitric acid and dilute with an equal volume of water. The solution should be freshly prepared. Nitric Acid, Concentrated. Olive Oil. Paraffine. Phoroglucin Tincture. Dissolve 0.1 gram in 10 cc. of 95 per cent alcohol. The solution deteriorates on keeping.