CONTENTS OF THE SEVENTH VOLUME. 



Part I. 



PAUK 



N°. I. On the Laws of the Reflexion and Refraction of Light at the common Surface 



of two non-crystallized Media: by George Green, B.A. of Caius College .... 1 



II. On Molecular Equilibrium. Part I. By the Rev. Philip Kelland, M.A., Queens' 



College, Cambridge ; Professor of Mathematics in the University of Edinburgh. 25 



III. On Rolling Curves: by Hamnett Holditch, M.A., Fellow of Cakes College. 6l 



IV. Note on the Motion of Waves in Canals: by Geohge Green, B.A. of Caius 



College 87 



V. On the Nature of the Molecular Forces which Regulate the Constitution of the 



Luminiferous Ether: by S. Eabnshaw, M.A. of St John's College 97 



VI. Supplement to a Memoir on the Reflexion and Refraction of Light: by G. Green, 



B.A. of Caius College 115 



Part II. 



VII. On the Propagation of Light in Crystallized Media: by G. Green, B.A. 



Fellow of Caius College 121 



VIII. On a Portion of the Tertiary Formations of Switzerland : by D. T. Ansted, 

 M.A., Fellow of Jesus College. Fellow of the Society and, of the Geological 

 Society; Professor of Geology in King's College, London 141 



IX. On the Quantity of Light intercepted by a Grating placed before a Lens; and 

 on the Effect produced by Interference: by the Rev. Philip Kelland, M.A., 

 F.R.SS.L. & E., late Fellow of Queens' College, Cambridge ; Professor of 

 Mathematics in the University of Edinburgh 153 



X. On the Foundation of Algebra, No. I.: by Augustus De Morgan, F.R.A.S., 

 F.C.P.S., of Trinity College; Professor of Mathematics in University College, 

 London 173 



XI. On the Effect of the Non-Residence of Landlords, fyc. on the Wealth of a 



Community : by J. Toze r, M. A., of Caius College 1 89 



XII. Demonstration that all Matter is heavy: by the Rev. William Whewell, 



B.D., Fellow of Trinity College and Professor of Moral Philosophy 197 



XIII. On the Position of the Axes of Optical Elasticity in Crystals belonging to the 



Oblique-Prismatic System: by W. H. Miller, M.A., F.R.S., Fellow and 

 Tutor of St John's College, and Professor of Mineralogy in the University 

 of Cambridge ' 209 



XIV. On a New Construction of the Going-Fusee : by G. B. Airy, Esq., Astronomer 



Royal 217 



