An Inquiry into the Nature of Death ; being an attempt to ascertain 

 its more immediate causes with a view to the better regulation of 

 the means of obviating them. By A. P. W. Philip, M.D. F.R.S. 

 L. &Ed .page 263 



On the Tides. By John William Lubbock, Esq. V.P. and Treas. R.S. 265 



An Account of some Operations executed at Cape Frio, by the Offi- 

 cers and Crew of His Majesty's Ship Algerine, for the purpose of 

 raising a part of the Stores, &c. lost in His Majesty's Ship Thetis. 

 By the Hon Commander F. T. de Roos, R.N. F.R.S 266 



An Account of a Concave Achromatic Lens, adapted to the Wired 

 Micrometer which has been named Macro-micro, from its power 

 to increase the primary image of a Telescope without increasing the 

 diameter of the wires in the Micrometer. By George Dollond, Esq. 

 F.R.S 267 



On the Structure and Functions of tubular and cellular Polypi; and of 

 Ascidiag. By Joseph Jackson Lister, Esq. F.R.S 268 



On the Theory of the Moon. ByJohn William Lubbock, Esq. V.P. 

 and Treas.R.S 270 



Some Suggestions relative to the best method of employing the new 

 Zenith Telescope lately erected at the Royal Observatory. By 

 John Pond, Esq. F.R.S. Astronomer Royal 270 



Narrative of the Proceedings of Commander Thomas Dickinson, of 

 His Majesty's Sloop Lightning, while employed in the Enterprise 

 for the Recovery of the Public Stores and other property sunk in 

 His Majesty's late Frigate Thetis, on the south-west side of the Island 

 of Cape Frio. By Commander Thomas Dickinson, R.N 271 



On a General Method in Dynamics, by which the Study of the Mo- 

 tions of all free Systems of attracting or repelling Points is reduced 

 to the Search and Differentiation of one central Relation, or charac- 

 teristic Function. By William Rowan Hamilton, Esq., Andrew's 

 Professor of Astronomy in the University of Dublin, and Royal 

 Astronomer of Ireland 275 



Observations on the Motions of Shingle Beaches. By Henry R. Palmer, 

 Esq. F.R.S 276 



On some Elementary Laws of Electricity. By W. Snow Harris, Esq. 

 F.R.S 277 



On the Generation of the Marsupial Animals ; with a Description of 

 the impregnated Uterus of the Kangaroo. By Richard Owen, Esq. 

 Member and Assistant Conservator of the Museum of the Royal 

 College of Surgeons, London 278 



On a new Law of Combustion. By Charles J. B. Williams, M.D.... 280 



On the Connexion between Refracted and Diffracted Light. By Paul 

 Cooper, Esq 281 



Observations on the Reciprocal Influence which Magnetic Needles 

 exercise over each other, when placed at a given distance within 

 their respective Spheres of Action, at different positions on the 

 Earth ; with Tables of numerical Results obtained at separate Sta- 

 tions. Also a method of discovering where certain local influences 

 are acting on the Needle, from which may be obtained a propor- 

 tional correction to be applied to Magnetic Observations in general. 

 By Edward J. Johnson, Esq., Commander R.N 282 



