CONTENTS. 



PAET II. 



Pagb 



N°. IX. Mathematical Exposition of Certain Doctrines of Political Economy. 



Third Memoir. By W. Whewell, D.D. Master of Trinity College. \_\~\ 



X. On the Effect of the Internal Friction of Fluids on the Motion of Pen- 



dulums. By G. G. Stokes, M.A. Fellow of Pembroke College, and 

 Lucasian Professor of Mathematics in the University of Cambridge . . . [8] 



XI. On some points of the Integral Calculus. By Augustus Db Morgan, 



of Trinity College, Secretary of the Royal Astronomical Society, and 

 Professor of Mathematics in University College, London ^107] 



XII. Of the Transformation of Hypotheses in the History of Science. By 



W. Whewell, D.D. Master of Trinity College l l3 9~] 



XIII. On the Colours of Thick Plates. By G. G. Stokes, M.A. Fellow of 



Pembroke College, and Lucasian Professor of Mathematics in the 

 University of Cambridge [1^7] 



XIV. The Deflexion of Imperfectly Elastic Beams and the Hyperbolic Law of 



Elasticity. By Homersham Cox, B.A. Jesus College, Cambridge . . [177] 



