CONTENTS of N° 227.— Fourth Series. 



I. Method of determining the Specific Gravity of Vapours and Gases. 

 By R. Bunsen, F.R.S., &c. (With a Plate.) page 1 



II. On Vortex Atoms. By Professor Sir William Thomson, F.R.S. 15 



III. On Professor Stokes's Proof of Clairaut's Theorem. By Arch- 

 deacon Pratt, F.R.S 25 



IV. Chemical Notices from Foreign Journals. By E. Atkinson, 

 Ph.D., F.C.S 26 



V. On certain recent Contributions to Astro-Meteorology. JBy H. 



A. Newton .". ... 34 



VI. Observations on Sir Benjamin Brodie's " Ideal Chemistry." By 



J. A. Wanklyn and R. R. F. Davey .. 50 



VII. On the Change that would be superinduced upon an Elliptic 

 Orbit if the intensity of the force of Gravity were influenced by the cen- 

 tripetal velocity of the Orbital Body. By J. J. Waterston, Esq. . . 55 



VIII. Inquiry as to whether the tendency to Dispersion of Cloud under 

 a Full Moon in any way depends on Lunar Influence. By William 

 Ellis, F.R.A.S 61 



IX. Proceedings of Learned Societies : — 



Royal Society : — Dr. W.J. Macquorn Rankine on a Property 



of Curves which fulfil the condition -— - + ——-=0 "65 



ax dy ■" 



Geological Society: — The Earl of Selkirk on ancient Sea- 

 marks on the Coast of Sweden; The Duke of Argyll on a Post- 

 Tertiary Lignite in Argyllshire ; Mr. W. S. Shea on recent dis- 

 coveries of Gold in New Brunswick ; Mr. W. Wheelwright on 

 the Discovery of Coal in the Andes ; The Rev. P. B. Brodie on 

 the Presence of Purbeck Beds at Brill, Buckinghamshire; Mr. H. 

 W. Bristow on the Lower Lias of Glamorganshire; Mr. C. 

 Moore on Abnormal Conditions of Secondary Deposits when 

 connected with the Somersetshire and South Wales Coal-basins ; 

 The Rev. P. B. Brodie on the Drift in a part of Warwickshire ; 

 Mr. W. B. Dawkins on the Dentition of Rhinoceros leptorki- 

 nus (Owen); Mr. J. W. Judd on the Strata of the Lincolnshire 

 Wolds 67-71 



X. Intelligence and Miscellaneous Articles : — 



Researches on the Absorbing-Action which certain Volatile Li- 

 quids and their Vapours exert on the Heat from a Lamp with a 

 Glass Chimney, by M. P. Desains 72 



On the Spectrum of Mars, with some Remarks on the Colour of 

 that Planet, by William Huggins, F.R.S 74 



On a New Method of determining the Resistance of Galvanic 

 Circuits, by Prof. V. Waltenhofer 77 



Researches on the Variation in the dispersion of Liquids under 

 the influence of Heat, by M. J.-B. Bailie 79 



*„* It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 





