CONTENTS. IX 



Page 



4. On a new Hand Dynamo-Machine. By W. II. Preece, F.R.S 447 



5. On Secondary Batteries, with special reference to Local Action. Bv J. II. 



Gladstone, Ph.D., F.R.S .". 447 



6. Demands of a System of Electrical Distribution. By F. J. Sprague, U.S. 

 Navy 448 



7. On the Comparison of the Mercury with the Hydrogen Thermometer. 



By Professor J. M. Grafts 449 



SATURDAY, AUGUST 26. 



1. Report on Recent Progress in Hydrodynamics. Part II. — Special Pro- 



blems. By W. M. Hicks, M.A 450 



2. On the Rotation of a Homogeneous Liquid Ellipsoid. By A. G. Greex- 

 HiLi, M.A 450 



3. On a Proof of Wilson's Theorem. By Professor Oaylet, F.R.S 450 



4. Integration of an Equation connected with the Elliptic Fimctions. By 



Captain P. A. MacMahon, R.A 450 



5. On the Establishment of the Elementary Principles of Quaternions on an 

 Analytical Basis. By Gustate Plaer, D.Sc 451 



G. On Linear Syzygetic Relations between the CoeiScients of Ternary Quad- 

 rics. By Professor R. W. Genese, M.A 452 



7. On the Rectifiable Spherical Epicycloid, or Involute of a Small Circle. 



By Hexry M. Jeffert, F.R.S 453 



8. On a Partial Diiferential Equation. By J. W. L. Glaisher, M.A., 

 F.R.S 454 



9. On a Theorem in Elliptic Functions. By J. W. L. Glaisher, M.A., 

 F.R.S 456 



MOiYBAY, AUGUST 28. 



1. Fifteenth Report of the Committee on Underground Temperature, con- 

 taining a Sj'nopsis of all previous Reports of this Committee 453 



2. On the Origin of Hail. By Professor Theodore Schwedofp 453 



3. Notes on Schwedoft's Theory of Hail. By Professor Silvanus P. 

 Thompson 458 



4. Second Report of the Committee on Meteoric Dust 459 



5. Sun Light and Sky Light at High Altitudes. By Captain W. de W. 

 Abney, F.R.S : 459 



6. On the Distribution of Energy in the Solar Spectrum. .By Professor 



S. P. Langley 459 



7. On a Similarity between Magnetical and Meteorological Weather. By 

 Professor Balfour Stewart, M.A., LL.D., F.R.S 4C0 



8. On a supposed Connection between the Heights of Rivers and the Number 

 of Sun-spots on the Sun. By Professor Balfour Stewart, M.A., 

 LL.D.,F.R.S 462 



