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ON THE EFFECT OF PREVIOUS MAGNETIC HISTORY ON MAGNETISA- 



TION. By Prof. Ernest Wilson, G. F. O'Dell, and H. W. K. Jennings .. 1 



ON THE RESOLVING POWER OF PHOTOGRAPHIC PLATES. By C. E. 



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THERMAL CONDUCTIVITY OF AIR AND OTHER GASES. By George W. 



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THE SPECTRUM OF RADIUM EMANATION. By Herbert Edmeston 



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Rayleigh, O.M., F.R.S 61 



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NOTE ON THE SPONTANEOUS LUMINOSITY OF A URANIUM MINERAL. 



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ON FLAPPING FLIGHT. By Maurice F. Fitzgerald, B.A 72 



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