CONTENTS. 



N°. XVIII. 



XIX. 



XX. 

 XXI. 



XXII. 



XXIII. 



XXIV. 



XXV. 



XXVI. 



XXVII. 



XXVIII. 



XXIX. 



PAET IV. 



Paoi 



On the Geology of some parts of Suffolk, particularly of the Valley of the 

 Gipping. By J. B. Phear, M.A. F.G.S. Fellow and Assistant Tutor 

 of Clare College 431 



On the Transformation of Surfaces by Bending. By James Clerk 

 Maxwell, B.A. Trinity College , 445 



On Self-repeating Series. By Henry Warbukton, M.A 471 



On the Determination of the Longitude of the Observatory of Cambridge by 

 Galvanic Signals. By the Rev. J. Challis, M.A. F.R.S. F.R.A.S. 

 Plumian Professor of Astronomy and Experimental Philosophy 487 



On some points in the Theory of Differential Equations. By Augustus 

 De Morgan, of Trinity College, Secretary of the Royal Astronomical 

 Society, and Professor of Mathematics in University College, London . . . 515 



On the Purbeck Strata of Dorsetshire. By the Rev. Osmond Fisher, 

 F.G.S. Fellow and Tutor of Jesus College 555 



On Plato's Survey of the Sciences. By W. Whewell, D.D. Master of 

 Trinity College 582 



On Plato's Notion of Dialectic. By W. Whewell, D.D. Master of Trinity 



College 590 



Of the Intellectual Powers according to Plato. By W. Whewell, D.D. 



Master of Trinity College 598 



Remarks on the Fundamental Principle of the Theory of Probabilities. By 



R. L. Ellis, M.A. late Fellow of Trinity College 605 



On the Singular Points of Curves, and on Newton's Method of Co-ordinated 

 Exponents. By Augustus De Morgan, of Trinity College, Vice- 

 President of the Royal Astronomical Society, and Professor of Mathe- 

 matics in University College, London 6'08 



On the External Temperature of the Earth, and the other Planets of the 

 Solar System. By W. Hopkins, M.A. F.R.S. of St Peter's College, 

 and Vice-President of the Society 6*28 



Index to Vol. IX 673 



