Chair: McCowan, John
Papers:
Chrystal, George: "A summary of the theory of the refraction of thin approximately axial pencils through a series of media bounded by coaxial spherical surfaces, with application to a photographic triplet, &c.", {Printed in Proceedings for Session 14. Title in minutes: "A Summary of the theory of a coaxial system of lenses for small apertures, according to Moebius and Gauss, with applications to a photographic triplet"}
Davis, Robert Frederick: "On a Diophantine equation"