( 4 ) 



Fry (M. W. J.) : The Centre of Gravity and the Principal Axes of any 

 Surface of equal pressure in a Heterogeneous Liquid covering a 

 Heterogeneous Solid composed of nearly Spherical Shells of equal 

 density, when the whole Mass is rotating with a small Angular 

 Velocity in Relative Equilibrium under its own Attraction. 1907. 

 pp. 6. 8vo. IS. • 



Graves (Rt. Rev. Dr.): Focal Circles of Spherical Conies. 1889 

 pp. 19. 4to. IS. 



JOLY (C. J.) : Theory of Linear Vector Functions. 1895. pp.51. 4to. 

 IS. 6a. 



JOLY(C. J.): Vector Expressions for Cur\'es. 1896. pp.25. 8vo. 2S. 



JOLY (C. J.) : Scalar Invariants of two Linear Vector Functions. 1896. 

 pp. 20. 4to. IS. 



JOLV(C. J.): Associative Algebra applicable to Hyperspace. 1898. 

 pp. 51. 8vo. 3s. 6d. 



Joly(C. J.): Quaternion Arrays. 1902. pp.14. 4to. is. 



JOLY (C. J.): Interpretation of a Quaternion as a Point Symbol. 1902. 

 pp. 10. 4to. IS. 



JOLY (C. J.): Representation of Screws by Weighted Points. 1902. 

 pp. 32. 4to. IS. 6d. 



JOLV (C. J.) : Geometry of a Three-System of Screws. 1903. pp. 32. 

 4to. IS. 



JOLY (C.J.) : The Quadratic Screw-System. 1903. pp.84. 410. 2s. 9d. 



M.\CFARIJVNE (A.): Differentiation in the Quaternion Analysis. 1901. 



pp 17. 8vo. 2s. 6d. 

 Orr (W. M'F.) : The StabiUty or Instability of the Steady Motions 



of a Perfect Liquid and of a Viscous Liquid- Part I.: A Perfect 



Liquid. 1907. pp. 60. 8vo. is. 6d. 

 Orr (W. M'F.) : The Stability or Instability of the Steady Motions 



of a Perfect Liquid and of a Viscous Liquid. Part II. : A Viscous 



Liquid. 1907. pp. 70. 8vo. 2s. 

 Orr (\V. M'F.): Extensions of Fourier's and the Bessel-Fourier 



Theorems. 1909. pp.44. 8vo. is. 6d. 

 Preston (T.) : Motion of a Particle, and the Equilibrium of Flexible 



Strings on a Spherical Surface. 1889. pp.24. 4to. is. 



Purser (F.): Application of Bessel's Functions to the Elastic Equili- 

 brium of a Homogeoeous Isotropic Cylinder. 1902. pp. 31. 4to. 

 IS. 6d. 



Pdrser (F.): On Ether Stress, Gravitational and Electrostatical. 

 1909. pp. II. 8vo. 6d. 



Roberts (R. A.): Properties of certain Plane Curves. 1886. pp.15. 

 4to. is. 



Roberts (W. R. W.) : Periods of the First Class of Hyper-elliptic 

 Integrals. 1881. pp. 16. 4to. is. 



Rogers (R. A. P.): The Logical Basis of Mathematics. 1908. 



pp. 12. 8vo. 6d. 

 Tarleton (F. a.): Deductions from M'CuIlagh's.Lectures on Rotation. 



1S82. pp. 12. 4to. IS. 

 Tarleton (F. A.): Mathematical Investigation of the Free Period of 



the Rocker. {In Alexander and Thomson on EUiptographs.) 1892 



pp. 40. 4to. 2s. 6d. 



Tarleton (F. A.) : The Relation of Mathematics to Physical Science. 

 1907. pp. 7. 8vo. 6d. 



Williamson (B.): Curvilinear Coordinates. 1891. pp.38. 4to. is. 6d. 



Sold by 



Hodges, Figgis, & Co., Ltd., 104, Grafton -street, Dublin ; and 



Williams & Norgate, 14, Henrietta-street, Covent Garden, 



London, W.C. 



