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Stroh has experimented upon tile ~'~dhesion of two metals in mutual contact during the passage of an electric current. Tile adhesion is manifested most strikinly when the metals touch upon two edges crosswise; it changes with the nature of the metal. S~roh attributed the adhesion to a superficial melting and welding, which can be perceived by a mlcroscope.~ Dinyler' s Journal ,, ,t C, Human Power for Short Intervals.--At a late national trial of fire engines Prof. Hartig made some wduable experiments upon the amount of strength that could be exerted, for a short period, at the engine bar. The engines were worked by foot soldiers, on a warm day: and under an exposure to the direct rays of the sun. The mean velocity of the handles was 1"77 metres per second; the mean value of the effective work ibr each man 22'58 kilogrammetres per second, or about 4'1 times the value which Morin and Weisbach assumed tbr the average of eight hours' continuons labor.~Dingler's Journal.
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