CONTENTS OF No. XVII. III. ON EXPERIMENTS FOR ASCERTAINING THE TEMPERATURE OF THE EARTH'S CRUST. By Edward Hull, F.R.S. IV. THE PAST AND PRESENT OF CHEMISTRY. By Dr. Herr- mann Kopp, Professor of Chemistry in the University V. THE IRON ORES OF GREAT BRITAIN. By Robert Hunt, F.R.S., Keeper of Mining Records Illustrated. 2. ARCHEOLOGY AND ETHNOLOGY 3. ASTRONOMY (including the Proceedings of the Royal Astro- a 7. GEOGRAPHY (including the Proceedings of the Royal Geo- |