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Contents of PROCEEDINGS, No. A 528. April, 1907. 



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Page 



EXPERIMENTS ON THE LENGTH OF THE CATHODE DARK SPACE 



WITH VARYING CURRENT DENSITIES AND PRESSURES IN DIFFERENT GASES. By 

 Francis William Aston, A.I.C., Research Scholar at the University of Birmingham 80 



ON THE DISCHARGE OF NEGATIVE ELECTRICITY FROM HOT 



CALCIUM AND FROM LIME. By Frank Horton, D.Sc, B.A., Fellow of St. John's College, 

 Cambridge. (Abstract) s, 96 



EXPERIMENTS ON THE DARK SPACE IN VACUUM TUBES. By Sir 



William Crookes, D.Sc, F.R.S .♦ .. .. 98 



ON THE PRESENCE OF EUROPIUM IN STARS. By Joseph Lunt, B.Sc, 



F.I.C., Assistant at the Royal Observatory, Cape of Good Hope .. .. .. .. .. .. .. 118 



NOTE ON THE APPLICATION OF VAN DER WAALS' EQUATION TO 



SOLUTIONS. By the Earl of Berkeley 125 



THE THERMOMAGNETIC ANALYSIS OF METEORIC AND ARTIFICIAL 



NICKEL-IRON ALLOYS. By S. W. J. Smith, M.A., A.R.C.S., Royal College of Science, London. 

 (Abstract) , 132 



THE OCCLUSION OF THE RESIDUAL GAS BY THE GLASS WALLS OF 



VACUUM TUBES. By A. A. Campbell Swinton 134 



A RECORDING CALORIMETER FOR EXPLOSIONS. By Bertram Hopkinson, 



Professor of Mechanism and Applied Mechanics in the University of Cambridge. (Plate i) .. .. .. 138 



ELECTRIC FURNACE REACTIONS UNDER HIGH GASEOUS PRES- 

 SURES. By R. S. Hutton and J. E. Petavel. (Abstract) 155 



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