TEANSACTIONS OF THE SECTIONS. 



Section A.— MATHEMATICAL AND PHYSICAL SCIENCE. 



THURSDAY, AUGUST 15, 1878. 



Page 



1. Report of the Committee on Underground Temperature 43:) 



2. Report of the Committee on the Mechanical Equivalent of Heat 433 



3. An Account of some Experiments on Specific Inductive Capacity. By J. 



E. H. Gordon, Assistant Secretary of the British Association 433 



4. On the Effect of Variation of Pressure on the Length of Disruptive Dis- 

 charge in Air. By J. E. H. Gordon, Assistant Secretary of the British 

 Association '. 433 



5. On the Absorption Spectrum of Chlorochromic Anhydride. By G. 

 Johnstone Stonet, M.A., F.R.S., Secretary to the Queen's University 

 in Ireland, and J. Emerson Reynolds, M.D., F.C.S., Professor of Chemistry 



in the University of Dublin 434 



6. On the Flow of Water in uniform regime in Rivers and in Open Channels 

 generally. By Professor James Thomson, LL.D., D.Sc, F.R.S 434 



7. Note on the Pedetic Action of Soap. By Professor W. Stanley Jevons, 

 F.R.S 435 



8. Motions produced by Dilute Acids on some Amalgam Surfaces. By Robert- 



Sabine 435 



9. Note on Surface Tension. By George Francis FitzGerald 430 



10. New Application of Gas for Lighthouses, illustrated by Models, full-sized 



Apparatus, &c. By J. R. Wigham, M.R.I.A 430 



11. A Short Description of two kinds of Fog Signals. By J. R. Wigham, 

 M.R.I.A 437 



12. A New Atmospheric Gas Machine. By J. R. Wigham, M.R.I.A 437. 



FRIDAY, AUGUST 16, 1878. 



1. Report of Committee on the Oscillation- Frequencies of the Rays of the 



Solar Spectrum. By G. Johnstone Stoney 438 



2. General Results of some Recent Experiments upon the Co-efficient of 



Friction between Surfaces Moving at High Velocities. By Douglas 

 Galton, C.B., D.C.L., F.R.S., &c 438 



3. On a Spectroscope of unusually large Aperture. By G. J. Stoney 441 



4. On the Support of Spheroidal Drops and allied Phenomena. By G. John- 



stone Stoney, M.A., F.R.S., George F. Fitzgerald, M.A., F.T.C.D., 

 and Richard J . Moss, Keeper of the Miuerals in the Museum of Science 

 and Art, Dublin 441 



