. The evolution of forces . t. ^ «» OPHTHALMIC OPERATIONS. By H. GRIMSDALE, , , , Westminster Ophthalmic Hospital, Ophtlto St. Georges Hospital; and E. BREWERTON, , Royal Westminster Ophthalmic Hospital,Surgeon Metropolitan Hospital, &c. With numerous Diagrams. Demy 8vo. price 12s. net. Surgeon, Royal Westminster Ophthalmic Hospital, Ophthalmic Surgeonto St. Georges Hospital; and Surgeon to Royal Westminster Ophthalmic Hospital, OphthalmicSurgeon Metropolitan Hospital, &c. NUTRITION AND DYSENTERY. By U. N. MUKERJI, , Member of the Royal College of Surgeons


. The evolution of forces . t. ^ «» OPHTHALMIC OPERATIONS. By H. GRIMSDALE, , , , Westminster Ophthalmic Hospital, Ophtlto St. Georges Hospital; and E. BREWERTON, , Royal Westminster Ophthalmic Hospital,Surgeon Metropolitan Hospital, &c. With numerous Diagrams. Demy 8vo. price 12s. net. Surgeon, Royal Westminster Ophthalmic Hospital, Ophthalmic Surgeonto St. Georges Hospital; and Surgeon to Royal Westminster Ophthalmic Hospital, OphthalmicSurgeon Metropolitan Hospital, &c. NUTRITION AND DYSENTERY. By U. N. MUKERJI, , Member of the Royal College of Surgeons, England, Medical Service. Crown 8vo. price 3s. 6d. : KEG AN PAUL, TRENCH, TRUBNER, & CO., Ltd. PLEASE DO NOT REMOVECARDS OR SLIPS FROM THIS POCKET UNIVERSITY OF TORONTO LIBRARY P& 1. Apparatus for the stiuhj of Black and 3. Apparatus used hy MM. Braidy and Le Bon for the determina-tion of the transparency of different bodies to the electric waves. The International Scientific SeriesEdited by F. Legge THE EVOLUTION OFFORCES PRESENTATION COPY. DR. GUSTAVE LE BON MEMBRE DE LACAI^^MIE PiOYALE ]iE BELGIQUE WITH FRONTISPIECE AND 42 FIGURES LONDON KEGAN PAUL, TRENCH, TRUBNER & CO. U^ dryden house, gerrard street, w. 1908 ■^ I »pp/vov V !^^^- O rZ/c nljhts of translation and of reproduction are reserved Printed by Ballantyne, HANSON &^ the Ballantyne Press, Edinburgh EDITORS PREFACE In the following pages, Dr. Gustave Le Bondevelops further the strikingly novel and originaltheories put forward by him in Linvolution de laMatierc} As in the last-named work, he enunciatedthe doctrine, which he was the first to deduce, thatall matter is continually in a state of dissociationand decay, so in this he goes in detail into thecorollary, there only brieevolutionofforce00lebouoft


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