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case of the smaller guns. This point is brought out in Captain Semen off's book, and no doubt in a measure accounts for the large proportionate effect produced by the Japanese 6-inch guns. The question of sec ondary armament is, as Sir William said, a vital one, and in view of the decided course taken by other navies should be carefully reconsidered.-The EngI neer. SIR J. J-THOMSON ON GOLF BALLS. IN a recent lecture at the Royal Institution Sir J. J. Thomson discussed the "Dynamics of a Golfdoi:10.1038/scientificamerican05141910-315bsupp fatcat:izjpdmvszndzbbsqkxfz5bzaha