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The Transmission of the Try2)anosoma Evansi by Horse Flies, and other 

 Experiments pointing to the probable Identity of Surra of India 

 and Nagana or Tsetse-fly Disease of Africa. By Leonard Eogers, 

 M.D., M.R.C.P., Indian Medical Service. Communicated by Major 

 D. Bruce, RA.M.C, F.R.S 163 



Meeting of March 21, 1901, and Lecture delivered 170 



Meeting of March 28, 1901, and List of Papers read 170 



No. 445. 



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

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



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

 Sir Norman Lockyer, K.C.B., F.R.S., and F. E. Baxandall, A.R.C.S. 178 



On the Arc Spectrum of Vanadium. Bv Sir Norman Lockyer, K.C.B., 

 F.R.S., and F. E. Baxandall, A.R.C.Sl 189 



A Preliminary Account of the Development of the Free-swimming 

 Nauplius of Leptodora hyalina (Lillj.). By Ernest Warren, D.Sc, 

 Assistant Professor of Zoology, University College, London. Com- 

 municated by Professor Weldon, F.R.S 210 



The Growth of Magnetism in Iron under Alternating Magnetic Force. 

 By Ernest Wilson. Communicated by Professor J. M. Thomson, 

 F.R.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, 

 Cambridge. Communicated by Professor J. J. Thomson, F.R.S 228 



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

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



No. 446. 



Elastic Solids at Rest or in Motion in a Liquid. By C. Chree, Sc.D., 

 LL.D., F.R.S 236 



On the Heat dissipated by a Platinum Surface at High Temperatures. 

 Part IV— High-pressure Gases. By J. E. Petavel, A.M.I.C.E., 

 A.M.I.E.E., John Harling Fellow of Owens College, Manchester. 

 Communicated by Professor Schuster, F.R.S 246 



Meeting of May 2, 1901, Names of Candidates recommended for elec- 

 tion, and List of Papers read 248 



Ellipsoidal Harmonic Analysis. By G. H. Darwin, F.R.S., Plumian 

 Professor and Fellow of Trinity College in the University of Cam- 

 bridge 248 



On the Small Vertical Movements of a Stone laid on the Surface of the 

 Ground. By Horace Darwin. Communicated by Clement Reid, 

 F.R.S : 253 



Meeting of May 9, 1901, and Proceedings „ 261 



