IV CONTENTS. 



Paet III. 



PAAB 



N° XII. On the Diffraction of an Object-glass with Circular Aperture: bt Professor 



Airy 283 



XIII. On the Equilibrium of the Arch: by the Rev. Hbnry Moseley 293 



XIV. Third Memoir on the Inverse Method of Definite Integrals: by the Rev. 



R. MuHPHY 315 



XV. On the Determination of the Exterior and Interior Attractions of Ellipsoids 



of Variable Densities : by George Green, Esq 395 



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



the Oblique- Prismatic System: by W. H. Miller, Esq 431 



ADVERTISEMENT. 



The Society as a hody is not to he considered responsible for any 

 Jucts and opinions advanced in the several Papers, which must rest 

 entirely on the credit of their respective Authors. 



The Society takes this opportunity of expressing its grateful 

 acknowledgments to the Syndics of the University Press, for their 

 liberality in taking upon themselves the expense of printing this 

 Part of its Transactions. 



