Vlll CONTENTS. 



Page 



7. On the Curve of Polarisation Stress, as determined by Mr. Orookes's Mea- 



sures with the Radiometer. By G. Johnstone Stoney, MA., F.R.S., 

 M.R.I.A 256 



8. On Complete Expansions for the Conduction of Heat and the Polarisation 

 Stress in Gases. By G. Johnstone Stoney, M.A., F.R.S., M.R.I.A. ... 256 



9. On the Action of Magnets on Liquid Jets. By Professor Sllvanus P. 

 Thompson, B.A., D.Sc 257 



10. On a Hypothesis concerning the Ether in connection with Maxwell's 



Theory of Electricity. By Dr. 0. J. Lodge 258 



11. On a New Electrometer Key. By Dr. 0. J. Lodge 258 



12. On Improvements in Dynamo-Electric Machines. By W. Ladd, F.R.A.S. 258 



13. On Lightning Protectors for Telegraphic Apparatus. By William 

 Heney Pbeece, Electrician, General Post-Office 259 



SATURDAY, AUGUST 23, 1879. 



1. Report of the Committee for Calculating Tables of the Fundamental In- 

 variants of Algebraic Forms 261 



2. Report of the Committee on Mathematical Tables 261 



3. On some Problems in the Conduction of Electricity. By A. J. C. Allen, 

 B.A., Scholar of Peterhouse * 261 



4. On the Fundamental Principles of the Algebra of Logic. By Alexandeb 

 Macfaelane, M.A., D.Sc, F.RS.E 262 



5. Note on a Theorem in Linear Differential Equations. By W. H. L. 



Russell, F.R.S 263 



6. On the Repulsion of Wires influenced by Electric Currents. By W. H. L. 

 Rttssell, F.R.S 263 



7. On Plane Class-Cubics with three Single Foci. By Heney M. Jeffeey, 

 M.A 263 



8. On a Modification of the Law of Facility. By Donald M'Alistee, B.A., 

 B.Sc 267 



9. Note on the Enumerations of Primes of the Forms 4n + 1 and 4w + 3. By 



J. W. L. Glaishee, M.A., F.R.S 268 



10. Forrnuhe in Elliptic Functions. By J. W. L. Glaishee, M.A., F.R.S.... 269 



11. Summation of a class of Trigonometrical series. By J. W. L. Glaishee, 

 M.A., F.R.S 269 



12. Note on a Method of Checking Calculations. By W. H. Walenn 271 



MONDAY, AUGUST 25, 1879. 



1. Report of the Committee on Tidal Observations in the English Channel... 272 



2. Report of the Committee on Calculations of Sun-heat Coefficients 272 



3. Report of the Committee on Luminous Meteors 272 



4. On the Direct Motion of Periodic Comets of Short Period. By Professor 



H. A. Newton 272 



5. On Self-acting Intermittent Siphons and the Conditions which determine 

 the Commenc ement of their Action. By Rogees Field, B. A 275 



6. A short Account of some Experiments made to determine the Friction of 

 Water upon Water at low Velocities. By the Rev. Samuel Haughton, 

 M.D., D.C.L 275 



