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Thermal Conductivity of Fluids.--H. F. Weber has experimented upon the thermal conductivity of water, glycerine, alcohol, ether, chloroform, benzine, olive oil, citron oil and various solutions, and he finds that lransparent, non-metallic fluids have nearly equal conductive power at equal temperatures.--Wiedera. Ann.
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Dressing for Leather.--A fine, brilliant, elastic dressing for leather, which does not injure shoes, can be made as follows: To three pounds of boiling water add, with continnual stirring, a half pound of white wax~ an ounce of transparent glue, two ounces of gum senegal, one and a half ounces white soap, and two ounces of brown candy. Finally, add two and a half ounces of alcohol, and, after the whole is cooled, three ounces of fine Frankfort 1)lack. The dressing is thinly applied to the leather with a soft brush and after it is dried it is rubbed with a piece of fine pumice stone and polished with a stiff brush.--Badisehe Gewerbe-Zeitung.
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Appropriate thermal design of an artificial soil freezing system should include the linking between the performance of the refrigeration system and the thermal regime in the soil, as well as the influence of variable thermal properties and complicated geometries. The paper presents design systems,