โ Scribed by R.H.O.
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June, I943.] CURRENT TOPICS. f)53 United States. The wide-spread rise of ground-water levels during 1942 in the Central States indicates that ground water storage in that area, which was so seriously depleted, is now the greatest in recent years. The inexplicable tendency of wet periods and dry periods to persist or to change slowly is demonstrated by the fact that the I2 months ended September 30, 1942, like the water year ended September 3o, 194 I, was again decidedly "upside down" with 35o,ooo square miles in the Eastern States having a runoff of only 69 per cent. of normal (6th driest year in 3o years), whereas in
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Anti-aircraft ArtiUery.--Development of a new and far more effective fire-control system for automatically aiming anti-aircraft artillery was announced recently by Bell Telephone Laboratories, with the approval of the Army Ordnance Corps for whom the project was undertaken. The new fire-control sys