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Contents of PROCEEDINGS, No. A 521. July, 1906. 



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Page 



A NOTE ON THE THEORY OF DIRECTIVE ANTENNAE OR 



UNSYMMETRICAL HERTZIAN OSCILLATORS. By J. A. Fleming, M.A., D.Sc., F.R.S. .. .. 1 



THE LAW OF DISTRIBUTION IN THE CASE IN WHICH ONE OF THE 



PHASES POSSESSES MECHANICAL RIGIDITY : ADSORPTION AND OCCLUSION. By 

 Morris W. Travers, D.Sc, F.R.S., Professor of Chemistry in University College, Bristol 9 



EFFECTS OF SELF-INDUCTION IN AN IRON CYLINDER. By Professor 



Ernest Wilson, King's College, London 22 



SOME PHYSICAL CONSTANTS OF AMMONIA : A STUDY OF THE 



EFFECT OF CHANGE OF TEMPERATURE AND PRESSURE ON AN EASILY CONDENSIBLE 

 GAS. By Edgar Philip Perman, D.Sc, Assistant Professor of Chemistry, and John Hughes Davies, 

 B. Sc., University College, Cardiff .. .. .. .. .. .. .. .. .. .. .. .. 28 



BAROMETRIC VARIATIONS OF LONG DURATION OVER LARGE 



AREAS. By William J. S. Lockyer, M.A., Ph.D., F.R.A.S., Chief Assistant, Solar Physics Observatory, 

 South Kensington. (Plates 1-5) .. .. .. .. .. .. .. .. .. .. .. .. .. 43 



THE TRANSITION FROM THE LIQUID TO THE SOLID STATE AND 



THE FOAM-STRUCTURE OF MATTER. By G. Quincke, For.Mem.R.S., Professor of Physics in the 

 University of Heidelberg .. .. .. .. .. .. .. .. .. ... .. .. .. .. 60 



ON THE OSMOTIC PRESSURES OF SOME CONCENTRATED 



AQUEOUS SOLUTIONS. By the Earl of Berkeley and E. G. J. Hartley. (Abstract) 68 



AN APPARENT PERIODICITY IN THE YIELD OF WHEAT FOR 



EASTERN ENGLAND, 1885 to 1005. By W. N. Shaw, Sc.D., F.R.S., Director of the Meteorological 



Office ' .. .. .. .. .. .. .. 69 



THE ELECTROSTATIC DEVIATION OF ct-RAYS FROM RADIO- 



TELLURIUM. By W. B. Huff, Associate Professor of Physics, Bryn Mawr College, Pa., U.S.A 77 



AN INVESTIGATION OF THE INFLUENCE OF ELECTRIC FIELDS ON 



SPECTRAL LINES : Preliminary Note. By Professor G. F. Hull, Dartmouth College, U.S.A 80 



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