iv 



On Rubian and its Products of Decomposition. By Edward Schunck, 

 Esq., F.R.S page 27 



On Periodical Laws discoverable in the mean effects of the larger 

 Magnetic Disturbances. By Lieut.-Col. Sabine 30 



On the Explanation of the so-called ' Mysterious Circles'. By the 

 Rev. Robert H. Atherton 33 



On the relation of the Direction of the Wind to the Age of the Moon, 

 as inferred from observations at the Royal Observatory, Greenmch, 

 from 1840 November to 1847 December. By G. B. Airy, Esq., 

 F.R.S., Astronomer Royal 33 



On the Meteorology of the Lake District, including the results of ex- 

 periments on the fall of Rain at various heights up to 3166 feet above 

 the sea-level. Fourth paper. For the year 1850. By John 

 Fletcher Miller, Esq., F.R.S., F.R.A.S., &c 34 



On the Rolling Motion of a Cylinder. By the Rev. H. Moseley, 

 M.A., F.R.S., &c 35 



On the Anatomy and Physiology of Salpa and Pyrosoma. By Tho- 

 mas H. Huxley, Esq 37 



On the Extraordinary Fall of Rain in the neighbourhood of London 

 on the 15th instant. By James Glaisher, Esq., F.R.S 39 



Observations upon Appendicularia and Doliolum. By Thomas H. 

 Huxley, Esq 41 



Researches into the Molecular Constitution of the Organic Bases. 

 Part IL By A. W. Hofmann, Ph.D 41 



Description and purpose of the glass plate which bears the inscription 

 ' Interferenz spectrum. Longitudo et celeritas undularum lucis re- 

 lativa cum in aere tum in vitro.' By T. A. Nobert 43 



Corrections of the (/onstants in the general theory of Terrestrial Mag- 

 netism. By Professor Kamtz 45 



An account of two cases in which an Ovule, or its remains, was disco- 

 vered after death in the Fallopian tube of the unimpregnated human 

 fem.ale, during the period of Menstruation. By H. Letheby, M.B. 55 



On the Megatherium : — Part IL By Professor Owen 57 



Note relating to M. Foucault's new mechanical proof of the Rotation 

 of the Earth. By C. Wheatstone, Esq., F.R.S., Corresponding 

 Member of the Academies of Science of Paris, Berlin, Brussels, 

 Turin, Rome, Dublin, &c 65 



Report of further Observations made upon the Tidal Streams of the 

 English Channel and German Ocean, under the authority of the Ad- 

 miralty, in 1849 and 1850. By Captain F. W. Beechey, R.N 68 



Additional Observations on the Diffusion of Liquids. By Thomas 

 Graham, Esq., F.R.S., F.C.S., &c 70 



On the Annual Variation of the Magnetic Declination, at different pe- 

 riods of the Day. By Lieut.-Col. Sabine, R.A., V.P., and Treas. 

 R.S., &c 73 



Sur les ondes atmospheriques. By M. Quetelet 74 



Researches in Symbolical Physics. On the Translation of a Directed 

 Magnitude as symbolised by a Product. The Principles of Statics 

 established symbolically. By the Rev. M. O'Brien, M. A., late Fel- 



