244
JOURNAL OF CHEMICAL EDUCATION
FEBRUARY,1930
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copper and 10 per cent aluminum) have made the metal famous. Now comes "duralumin," the light and strong alloy used in making the framework of Zeppelins, successful plating of nickel and chromium on aluminum, light aluminum furniture that looks like wood, and the marvelously pure "alclad" sheet which is rolled on the strong duralumin to give it better resistance to corrosion. The story of Charles M. Hall,' like the classics, will be told many times but it will never lose its appeal to the imagination. For an obituary note see "Charles M. Hall," by C. F. Chandler, J . Ind. Eng. Chem., 7 , 1 5 5 7 (Feb., 1915).
Germs Measure Strength of New Disinfectants. Making germs step up and get killed by new disinfectants and antiseptics, to get an idea of the strength the latter substances will have when used in active service, is one of the tricks of the trade in modern bacteriology. One of the most evil of germs, the gonococcus, cause of one of the so-called social diseases, is employed in this way by Herbert C. Hamilton of Detroit. At the fall meeting of the American Chemical Society a t Minneapolis he described his technic for using this dangerous organism in standardizing germicidal chemicals.Science Semrice
