TABLE OF CONTENTS. 



PAGE 



I. On the Description of Oval Curves and those having a plurality of Foci; ivith 



remarks by Professor Forbes ......... 1 



II. On the Theory of Rolling Curves 4 



III. On the Equilibrium of Elastic Solids 30 



Solutions of Problems .......... ^ . 74 



IV. On the Transformation of Surfaces by Bending 80 



V. On a particular case of the descent of a heavy body in a resisting medium . 115 



VI. On the Theory of Colours in relation to Colour-Blindness 119 



VII. Experiments on Colour as perceived by the Eye, with remarks on Colour-Blindness 126 



VIII. On Faraday's Lines of Force / . . . .155 



IX. Description of a New Form of the Piatometer, an Instrument for measuring the 



areas of Plane Figures drawn on paper 230 



X. On the elementary theory of Optical Instruments ... . . 238 



XI. On a method of drawing the Theoretical Forms of Faraday's Lines of Force 



without calculation .... 241 



XII. On the unequal sensibility of the Foramen Centrale to Light of different Colours 242 



XIII. On the Theory of Compound Colours with reference to mixtures of Blue and 



Yellow Light . ...... .243 



XIV. On an instrument to illustrate Poinsot's Theory of Rotation . 246 



XV. On a Dynamical Top, for exhibiting the phenomena of the motions of a body of 



invariable form about a fixed point, with some suggestions as to the Earth's 



motion 248 



XVI. Account of Experiments on the Perception of Colour . . 263 



XVII. On the general laws of Optical Instruments . .271 



XVIII. On Theories of the Constitution of Saturn's Rings 286 



XIX. On the stability of the motion of Saturn s Rings 



XX. Illustrations of the Dynamical Theory of Gases . . & 



XXI. On the Theory of Compound Colours and the Relations of the Colours of the 



Spectrum 



XXII. On the Theory of Three Primary Colours . 445 



XXIII. On Physical Lines of Force .... .451 



XXIV. On Reciprocal Figures and Diagrams of Forces . 



XXV. A Dynamical Theory of the Electromagnetic Field 



XXVI. On the Calculation of the Equilibrium and Stiffness of Frames . 598 



