Vlll CONTENTS. 



Page 



5. On the Cause of Travelling Motion of Spheroidal Drops. By G. John- 

 stone Stoney, M.A., F.R.S 442 



6. The Stanhope "Demonstrator," or Logical Machine. By Robert Harlet 442 



7. Sur ur.e nouvelle Methode de Photographie Solaire et les Decouvertes 

 qu'elle donne touchant la veritable nature de la Photosphere. Par Dr. 



J. Janssen 443 



8. Sur la Constitution des Spectres Photographiques quand Taction lumi- 

 neuse est extrernenient courte. Par Dr. J. Janssen 445 



9. Quelques remarques sur l'eclipse totale et la Couronne. Par Dr. J. 

 Janssen 445 



10. On a New Form, of Receiving Instrument for Microphone. By W. J. 



Millar, C.E., Sec. Inst. Engineers and Shipbuilders in Scotland 440 



MONDAY, AUGUST 19, 1878. 



General Section. 



1. Report of the Committee on Atmospheric Electricity 448 



2. On Edmunds' Electrical Phonoscope. By W. Ladd 448 



3. On Byrne's Compound Plate Pneumatic Battery. By W. Ladd 448 



4. A Diagonal Eyepiece for certain Optical Experiments. By Professor G. 



Forbes 449 



5. A Clock with Detached Train. By Professor G. Forbes 449 



0. An Instrument for Indicating and Measuring the Fire-damp in Mines. By 

 Professor G. Forbes .'. 449 



7. On certain Phenomena Accompanying Rainbows. By Professor Silyant/s 



P. Thompson, D.Sc, B.A 450 



8. New Magnetic Figures. By Silvanus P. Thompson, B.A., D.Sc, Pro- 

 fessor of Experimental Physics in University College, Bristol 450 



9. On Dimensional Equations, and on some Verbal Expressions in Numerical 



Science. By Professor James Thomson, LL.D., D.Sc, F.R.S 451 



10. On Lead and Platinised Lead as a Substitute for Carbon and Platinised 



Silver, in Leclanche, Bichromate, and Smee's Batteries. By Edward T. 

 Haedman, F.O.S., &c 453 



11. On a New Form of Electro-Registering Apparatus. By Denny Lane ... 454 



12. On an Isochronic Pendulum. By Denny Lane 455 



18. The Temperature of the Earth Within. By William Morris 450 



14. On Sunspots and Rainfall. By O. Meldeum 457 



15. On Lightning Conductors. By R. Anderson 457 



Department of Mathematics. 



1. Report of the Committee on Babbage's Analytical Engine 457 



2. Report of the Committee on Mathematical Tables, with an Explanation of 



the Mode of Formation of the Factor Table for the Fourth Million 457 



3. On a New Form of Tangential Equation. By John Casey, LL.D., F.R.S., 



M.R.I.A., Professor of Mathematics in the Catholic University of Ireland 457 



4. On the Eighteen Co-ordinates of a Conic in Space. By William Spottis- 



woode, F.R.S., &c, &c, President 402 



5. On the Modular Curves. By Professor II. J. S. Smith -103 



