CONTENTS. 



PAGE 



Mr W. M C F. Obr, On the product J m {oc)J n (x) . . . . .93 



Rev. H. J. Sharpe, On the Reflection of Sound at a Paraboloid . . 101 



Mr A. C. Seward, Notes on the Binney Collection of Coal-Measure 



Plants. Plates III. to VII .137 



Mr D. Sharp, The Modification and Attitude of Idolum diabolicum, 



a Mantis of the kind called "floral simulators." Plate II. . 175 



Mr J. Larmor, On the Origin of Magneto-optic Rotation . . .181 



Proceedings at the Meetings held during the Session 1898 — 1899 . . 183 



