X CONTENTS. 



Page 



11. On a new Method of maintaining the Motion of a Free Pendulum in 



vacuo. By David Gill 486 



12. On Space Numbers : an Extension of Arithmetic. By B. H. Hinton 486 



Department op Physical Science. 



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

 Elasticity of Wires 486 



2. A New Form of Polariscope. By Professor William Grylls Adams, 



M.A., F.R.S 486 



3. A New Determination of the Number of Electrostatic Units in the Electro- 



Magnetic Unit. By W. E. Ayrton and J. Perry. Telegram and Letter 



to Sir W. Thomson from Professor W. E. Atrton 487 



4. On Apparatus employed in Researches on Orookes's Force. By Richard 



J. Moss, FC.S 489 



5. On Spheroidal Drops. By Richard J. Moss, F.C.S 489 



6. On the Spherical Class-Cubic with Three Single Foci. By Henry M. 



Jeffery, M.A 490 



7. On a Cubic Surface referred to a Pentad of Co-tangential Poiuts. By 

 Henry M. Jeffery, M.A 491 



8. A New Form of Trap-Door Electrometer. By Professor Barrett 495 



9. On Unilateral Conductivity in Tourmaline Crystals. By Professor Sil- 



vanus P. Thompson and Dr. Oliver J. Lodge 495 



10. On Gaussin's Warning regarding the Sluggishness of Ships' Magnetism. 



By Sir William Thomson, F.R.S 496 



11. On the Electrical Properties of Bees' Wax and Lead Chloride. By Pro- 

 fessors J. Perry and W. E. Atrton 497 



12. Theory of Voltaic Action. By J. Brown 498 



13. Mutual Action of Vortex Atoms and Ultramundane Corpuscles. By 



Professor G. Forbes 498 



Section B.— CHEMICAL SCIENCE. 



THURSDAY, AUGUST 15, 1878. 



Address by Professor Maxwell Simpson, M.D., F.R.S., F.C.S., President of 



the Section 501 



1. Report of Committee on some of the lesser-known Alkaloids 504 



2. Report on the best means of Developing Light from Coal Gas, Part I. ... 504 



3. On the Amounts of Sugar contained in the Nectar of various Flowers. Bv 

 Alex. S. Wilson, M.A., B.Sc .'. 504 



4. On the Action of Chlorine upon the Nitroprussides. By Dr. Edmund W. 

 Davy, Professor of Forensic Medicine, Royal College of Surgeons, Ireland 505 



5. The Adulteration Act in so far as it relates to the Prosecution of Milk- 



sellers. By Ernest H. Cook, B.Sc, F.R.C.S., Lecturer upon Experi- 

 mental Physics at the Bristol Trade and Mining School 506 



6. On some Fluor Compounds of Vanadium. Bv Professor H. E. Roscoe, 

 Ph.D., F.R.S 507 



