( 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. 

 Fry (M. W. J.) : Real and Complex Numbers considered as Adjectives 



or Operators. 1914. pp. 16. 8vo. 6d. 

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



is. 6d. 

 Joly (C. J.) : Vector Expressions for Curves. 1896. pp.25. 8vo. 2s. 

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



pp. 20. 4to. is 

 Joly (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. 16. 4to. is. 

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



pp. 32. 4to. is. 6d. 

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



4to. is. 

 Joly(C.J.): The Quadratic Screw- System. 1903. pp.84. 4to. 2s. 9d, 

 "Kelleher (S. B.) : A 3 -Dimensional Complex Variable. 1915. pp.6. 



8vo. 6d 

 Leathem (J. G.) : On Doublet Distributions in Potential Theory. 



1 914. pp. 20. 8vo. 6d. 

 Macfarlane (A.) : Differentiation in the Quaternion Analysis. 1901. 



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

 Orr (W. M'F.) : The Stability 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 (W. M'F.): Extensions of Fourier's and the Bessel- Fourier 



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

 ORR (W. M'F.): Extensions of Fourier's and the Bessel-Fourier 



Theorems. Second Paper. 1911. pp.23. 8vo. 6d. 

 Plummer (H. C.) : Note on the Use of Conjugate Functions in some 



Dynamical Problems. 1914- pp. 8. 8vo. 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 Homogeneous Isotropic Cylinder. 1902. pp.31. 4to. 

 is. 6d. 

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



1909. pp. 11. 8vo. 6d. 



Roberts (W, R. W.): The Symbolical Expression of Eliminants. 



1910. pp. 7. 8vo. 6d. 



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



pp. 12. 8vo. 6d. 

 Rogers (R. A. P.> : Some Differential Properties of the Orthogonal 



Trajectories of a Congruence of Curves, with an Application to 



Curl and Divergence of Vectors. 1912. pp. 26. 8vo. 6d. 

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



the Rocker. (In Alexander and Thomson on Elliptographs.) 1892. 



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

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



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

 Wang (K. T.): The Differentiation of Quaternion Functions. 1911. 



pp. 8. 8vo. 6d. 

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



Sold by 



Hodges, FIGGIS, & Co., LTD., 104, Grafton-street, Dublin; una 



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



London, W.C. 



