Viii CONTENTS. 



Page 

 Mr. Mungo Ponton's Further Researches regarding the Laws of Chromatic 



Dispersion 16 



Professor William B. Rogers's Experiments and Conclusions on Binocular 



Vision 17 



M. Serrin, Regulateur Automatique de Lumiere Electrique 19 



Mr. Balfour Stewart on some Recent Extensions of Prevost's Theory of Ex- 

 changes 19 



Mr. G. Johnstone Stoney on Rings seen in viewing a Light through Fibrous 



Specimens of Calc-spar 19 



Mr. R. Thomas on Thin Films of Decomposed Glass found near Oxford 19 



Electricity, Magnetism. 



Mr. John Allan Broun on certain Results of Observations in the Observa- 

 tory of His Highness the Rajah of Travancore 20 



*— ; on the Diurnal Variations of the Magnetic Declina- 

 tion at the Magnetic Equator, and the Decennial Period 21 



1 on a New Induction Dip-Circle 23 



" on Magnetic Rocks in South India 24 



" on a Magnetic Survey of the West Coast of India... 27 



"' on the Velocity of Earthquake Shocks in the Late- 

 rite of India 28 



Mr. A. Ci arke on a Mode of correcting the Errors of the Compass in Iron 

 Ships 28 



Sir W. Snow Harris on Electrical Force 28 



Rev. T. Rankin on the different Motions of Electric Fluid 30 



Professor W. B. Rogers on the Phenomena of Electrical Vacuum Tubes, in a 

 letter to Mr. Gassiot 30 



M. H. von Schlagintweit's General Abstract of the Results of Messrs. de 

 Schlagintweit's Magnetic Survey of India, with three Charts 32 



M. Werner and Mr. C. W. Siemens, Outline of the Principles and Prac- 

 tice involved in dealing with the Electrical Conditions of Submarine Electric 

 Telegraphs 32 



Astronomy. 



Mr. W. R. Birt on the Forms of certain Lunar Craters indicative of the Ope- 

 ration of a peculiar degrading Force 34 



Professor Hennessy on the Possibility of Studying the Earth's Interna! Struc- 

 ture from Phenomena observed at its Surface 35 



Rev Edward Hincks on some Recorded Observations of the Planet Venus in 

 the Seventh Century before Christ 35 



U u R ; J^ D6S ° N ° n the briiliant Eruption on the Sun's Surface, 1st Septem- 

 ber 1859 F -» 



Dr. John Lee's Prospectus of the Hartwell Variable Star Atlas, with six Speci- 

 men Proofs * „. 



30 



Professor B. Pierce on the Physical Constitution of Comets 37 



' ' on tlie Dynamic Condition of Saturn's Rings 37 



/ 



