PROCEEDINGS OF 



THE ROYAL SOCIETY. 



YOL. LXVIII. 



No. 445. 



CONTENTS. 



PAGE 



On the Eesults of Chilling Copper- Tin Alloys. By C. T. Heycock, F.E.S., 



and F. H. Neville, F.E.S. (Plates 2-3) 171 



On the Enhanced Lines in the Spectrum of the Chromosphere. By Sir 



Norman Loceyer, KC.B., F.B.S., and F. E. Baxandall, A.E.C.S. . 178 



On the Arc Spectrum of Vanadium. By Sir Norman LockYer, K.C.B., 



F.E.S., and F. E. Baxandall, AJR.C.S 189 



A Preliminary Account of the Development of the Free-swimming Nauplius 

 of Leptodora Tiyalina (Lillj.). By Ernest Warren, D.Sc, Assistant 

 Professor of Zoology, University College, London. Communicated by . 

 Professor Weldon, F.E.S 210 



The G-rowth of Magnetism in Iron under Alternating Magnetic Force. By 



Ernest Wilson. Communicated by Professor J. M. Thomson, F.E.S. 218 



On the Electrical Conductivity of Air and Salt Vapours. By Harold A. 

 Wilson, D.Sc, M.Sc, B.A., Allen Scholar, Cavendish Laboratory, Cam- 

 bridge. Communicated by Professor J. J. Thomson, F.E.S. . . . 228 



Further Observations on Nova Persei, No. 2. By Sir Norman Lockyer, 



K.C.B., F.E.S 230 



Price Three Shillings. 



May 23, 1901. 



