Newton, Sir Isaac.

Sir J. J. Thomson, Cavendish Professor of Experimental Physics and Fellow of Trinity College, Cambridge. President of the British Association, 1909–1910. Author of A Treatise on the Motion of Vortex Rings; Application of Dynamics to Physics and Chemistry:

Matter; and several articles on Electrical Science.

J. Walker, Christ Church, Oxford. Demonstrator in the Clarendon laboratory. Formerly Vice-President of the Physical Society. Author of The Analytical Theory of Light, etc.:

Polarization of Light; Refraction, Double Refraction.

A. N. Whitehead, Fellow and Lecturer in Mathematics, Trinity College, Cambridge. Author of A Treatise on Universal Algebra, etc.:

Geometry VI. Non-Euclidean Geometry (in part); Geometry VII. Axioms on Geometry; Mathematics.

These are the men who are responsible for the mathematical sections of the Britannica. A fuller list of articles on mathematical subjects is given below.

CHAPTER LIII
ASTRONOMY