The Volume has been edited by the Honorary Secretary. The Authors have revised their Papers. The Authors alone are responsible for facts and opinions. The Society exchanges Proceedings with other publishing bodies, through the Librarian, from whom back numbers may be obtained. CONTENTS. PAGE Mr. JOHN W. ELLIS, L.R.C.P., F.E.S., "Notes on the Cooke Collection of British Lepidoptera." Mr. MARRATT, "Some Precious Stones." 425895 Mr. T. J. MOORE, "Recent Additions to the Liverpool Mr. HERBERT SADLER on "Celestial Photography." Mr. W. H. MONCK on "The Causes of Variation in Mr. W. F. DENNING on "Illustrated Notes on the Rev. THOMAS P. KIRKMAN, "On the three Zeros Necessary, A Priori, and Transcendental; or- an Enquiry into the Philosophical Value of the |