X CONTENTS. 



Page 

 4. On a Septum permeable to Water and impermeable to Au", with practical 

 applications to a Navigational Deptli-gauge. By Professor Sir William 

 Thomson, M.A., F.R.S 488 



6. On the Eifect of Oil in destroying Waves on the Surface of Water. By 

 Professor Osboene Reynolds, MA., F.R.S 489 



6. Experiments on tbin Films of AVater, with regard to their absorption of 

 Radiant Heat. By the Hon. F. A. R. Russell 490 



7, On an Experimental lUustratiou of Minimum Energy in Vortex Motion. 



By Professor Sir Wllliam Thomson, M.A., F.R.S 491 



8. On a Disturbing Infinity in Lord Rayleigh's Solution for Waves in a 

 Plane Vortex Stratum. By Professor Sir William Thomson, M.A., 

 F.R.S 492 



9, Supplement to a Paper on the Synchronism of Mean Temperature and 

 Rainfall in the Climate of London. By H. Cottetenat Fox, M.R.G.S.... 493 



TUESBA Y, A UG UST 31. 



1. Report of the Committee for commencing Secular Experiments on the 

 Elasticity of Wh-es 494 



2. On the Elasticity of Wires. By J. T. Bottomley, M.A., F.R.S.E 494 



3. Report of the Committee on the Specific Liductive Capacity of a good 

 Sprengel Vacuum 494 



4. On a method of measui-ing Contact Electicity. By Professor Sir William 

 Thomson, M.A., F.R.S 494 



5. On a method of determining without mechanism the limiting Steam- 

 Liquid Temperature of a Fluid. By Professor Sir William Thomson, 

 M.A., F.R.S 496 



6. On the possibihty of originating Wave-disturbances in the Ether by Electro- 



magnetic Forces. By G. F. FiTZGEKALD 497 



7. On the number of Electrostatic Units in the Electro-magnetic Unit. By 



R. Shlda, M.E., Imperial College of Engineering, Tokio, Japan 497 



8. On an Electro-magnetic Gyroscope. By W. de Fonvielle 500 



9. Sur les Transformations successives des Images photographiques, et les 

 Applications a lAstronomie. Par M. J. Janssen, de I'lnstitut, Directeur 



de r Observatoire de Meudon 500 



10. On Improvements in Electro-Motors. By Theodor Wiesendanger 501 



11. On a New Mode of Illuminating Microscopic Objects. By Philip Beaham, 

 F.C.S 502 



12. On an Instrtmient for the Detection of Polarised Light. By Philip 

 Beaham, F.C.S 502 



Section B.— CHEMICAL SCIENCE. 



THURSDAY, AUGUST 26. 



1. Report of the Committee on the Best Means for the Development of Light 



from Coal-Gas of dififerent qualities. Part H 503 



2. On some Relations between the Atomic Volumes of Certain Elements and 

 the Heats of Formation of some of their Compounds. By Walter 

 Weldon, F.R.S.E :. 503 



