CONTENTS. 



XIV. On some Elementary Laws of Electricity. By W. Snow Harris^ Esq, F.R.S, 



S^c page 213 



XV. On a Ge7ieral Method in Dynamics; by which the Study of the Motions of all free 



Systems of attracting or repelling Points is reduced to the Search and Differen- 

 tiation of one central Relation, or characteristic Function. By William Rowan 

 Hamilton, Member of several scientific Societies in the British Dominions, and 

 of the American Academy of Arts and Sciences, Andrews Professor of Astro- 

 nomy in the University of Dublin, and Royal Astronomer of Ireland. Commu- 

 nicated by Captain Beaufort, R.N. F.R.S. 247 



XVI. An Investigation of the Laws which govern the Motion of Steam Vessels, deduced 

 from Experiments. By Peter W. Barlow, Esq. Civil Engineer. Communi- 

 cated by Peter Barlow, Esq. F.R.S 309 



XVII. On the Generation of the Marsupial Animals, with a Description of the Impreg- 

 nated Uterus of the Kangaroo. By Richard Owen, Esq., M.R.C.S. and As- 

 sistant Conservator of the Museum of the Royal College of Surgeons, London. 

 Communicated by Sir Anthony Carlisle, F.R.S. . 333 



XVIII. Some Observations on the Structure and Functions of tubular and cellular 

 Polypi, and of As cidice. By Joseph Jackson Lister, Esq. F.R.S. . .365 



XIX. On the Nervous System of the Sphinx ligustri, Linn., (Part II.) during the 

 latter stages of its Pupa and its Imago state ; and on the Means by which its 

 Development is effected. By George Newport, Esq. Communicated by P. M. 

 RoGET, M.D. Sec. R.S. 389 



XX. Experimental Researches in Electricity. — Eighth Series. By Michael Faraday, 



D.C.L. F.R.S. Fullerian Prof Chem. Royal Institution, Corr. Memb. Royal 

 and Imp. Acadd. of Sciences, Paris, Petersburgh, Florence, Copenhagen, Ber- 

 lin, 8s c 425 



XXI. On the Functions of some parts of the Brain, and on the relations between the 

 Brain and Nerves of Motion and Sensation. By Sir Charles Bell, F.R.S. 471 



XXII. On the repulsive Power of Heat. By the Rev. Baden Powell, M.A. F.R.S. 

 Savilian Professor of Geometry in the University of Oxford 485 



