viii 



Page 



Bakerian Lecture. — On the Constitution of the Copper-Tin Series of 

 Alloys. By C. T. Heycock, F.R.S., and F. H. Neville, F.E.S. 



(Abstract) 409 



On the Formation of Barrier Reefs and of the different Types of Atolls. 

 By Alexander Agassiz, For. Mem. R.S 412 



The Electrical Conductivity imparted to a Vacuum by Hot Conductors. 

 By O. W. Richardson, B.A., B.Sc, Fellow of Trinity College, Cam- 

 bridge. Communicated by J. J. Thomson, F.R.S. (Abstract) 415 



On a New Series of Lines in the Spectrum of Magnesium, By A. 

 Fowler, A.R.C.Sc, F.R.A.S., Assistant Professor of Physics, Royal 

 College of Science, South Kensington. Communicated by H. L. 

 Callendar, F.R.S 419 



An Attempt to Estimate the Relative Amounts of Krypton and of 

 Xenon in Atmospheric Air. By Sir William Ramsay, K.C.B., F.R.S. 421 



Some Physical Properties of Nickel Carbonyl. By James Dewar, 

 M.A., Sc.D., LL.D., F.R.S., Jacksonian Professor in the University 

 of Cambridge, and Humphrey Owen Jones, M.A., Fellow of Clare 

 College, Jacksonian Demonstrator in the University of Cambridge.... 427 



An Enquiry into the Variation of Angles observed in Crystals, 

 especially of Potassium- Alum and Ammonium- Alum. By Professor 

 H. A. Miers, M.A., D.Sc, F.R.S. (Abstract) 439 



On the Dependence of the Refractive Index of Gases on Temperature. 

 By George W. Walker, M.A. Communicated by Professor J. J. 

 Thomson, F.R.S. (Abstract) , 441 



On the Evolution of the Proboscidea. By C. W. Andrews, D.Sc. 

 Communicated by Professor E. Ray Lankester, F.R.S. (Abstract).... 443 



A Comparative Study of the Grey and White Matter of the Motor 

 Cell Groups, and of the Spinal Accessory Nerve, in the Spinal Cord 

 of the Porpoise (Phoccena communis). By David Hepburn, M.D., and 

 David Waterston, M.A., M.D. Communicated by Sir Wm. Turner, 

 F.R.S. (Abstract) 444 



No. 475. 



Solar Prominence and Spot Circulation, 1872—1901. By Sir Norman 

 Lockyer, K.C.B., F.R.S., and William J. S. Lockyer, Chief Assistant 

 Solar Physics Observatory, M.A. (Camb.), Ph.D. (Gott.), F.R.A.S. 

 (Plates 6 and 7) 446 



On the Cytology of Apogamy and Apospory. I. Preliminary Note on 

 Apogamy. By J. B. Farmer, F.R.S., J. E. S. Moore, and L. Digby 453 



A Study of a Unicellular Green Alga, occurring in Polluted Water, 

 with especial Reference to its Nitrogenous Metabolism. By Harriette 

 Chick. Communicated by Professor Rubert Boy ce, F.R.S. (Plate '8) 458 



On Lagenostoma Lomaxi, the Seed of Lyginodenclron. Bv F. W. Oliver, 

 D.Sc, F.L.S., and D. H. Scott, M.A., Ph.D., F.R.S .. 477 



