CONTENTS, 

 VOL. XLIY. 



No. 266.— April 12, 1888. 



The Bakerian Lecture. — Suggestions on the Classification of the 

 various Species of Heavenly Bodies. A Report to the Solar Physics 

 Committee. Communicated at the request of the Committee. By J. 

 Norman Lockyer, F.R.S. (Plate 1) 1 



List of Presents 93 



No. 267.— April 19, 1888. 



The Badio-Micrometer. By C. V. Boys, A.R.S.M. 96 



On Hamilton's Numbers. Parfc II.. By J. J. Sylvester, D.C.L., F.R.S., 

 Savilian Professor of Geometry in the University of Oxford, and J ames 

 Hammond, M.A. Cantab \ * 99 



Hydraulic Problems on the Cross-sections of Pipes and Channels. By 

 Henry Hennessy, F.B.S., Professor of Applied Mathematics and 

 Mechanism in the Royal College of Science for Ireland 101 



On the Heating Effects of Electric Currents. No. III. By W. H. 

 Preece, F.R.S. 109 



On the Compounds of Ammonia with Selenium Dioxide. By Sir Charles 

 A. Cameron, V.P.I.C., F.R.C.S.I., and John Macallan, F.I.C 112 



On the Logarithmic Law of Atomic Weights. By G. Johnstone Stoney, 

 M.A, D.Sc, F.R.S . 115 



List of Presents 117 



April 26, 1888. 



On the Coagulation of the Blood. Preliminary Communication. By 

 W. D. Halliburton, M.D., B.Sc, Assistant Professor of Physiology, 

 University College, London 120 



On the Development of the Electric Organ of Rata batis. By J. C. 

 Ewart, M.D., Regius Professor of Natural History, University of 

 Edinburgh 120 



