THE EDINBURGH NEW PHILOSOPHICAL JOURNAL, EXHIBITING A VIEW OF THE PROGRESSIVE DISCOVERIES AND IMPROVEMENTS IN THE SCIENCES AND THE ARTS. LELAND STANON JUNIOR CONDUCTED BY ROBERT JAMESON, REGIUS PROFESSOR OF NATURAL HISTORY, LECTURER ON MINERALOGY, AND KEEPER OF Fellow of the Royal Societies of London and Edinburgh; Honorary Member of the Royal Irish Academy; of the Royal Society of Sciences of Denmark; of the Royal Academy of Sciences of Berlin; of the Royal Academy of Naples; of the Geological Society of France; Honorary Member of the Asiatic Society of Calcutta ; Fellow of the Royal Linnean, and of the Geological Societies of London; of the Royal Geological Society of Cornwall, and of the Cambridge Philosophical Society; of the Antiquarian, Wernerian Natural History, Royal Medical, Royal Physical, and Horticultural Societies of Edinburgh; of the Highland and Agricultural Society of Scotland; of the Antiquarian and Literary Society of Perth; of the Statistical Society of Glasgow; of the Royal Dublin Society; of the York, Bristol, Cambrian, Whitby, Northern, and Cork Institutions; of the Natural History Society of Northumberland, Durham, and Newcastle; of the Imperial Pharmaceutical Society of Petersburgh; of he Natural History Society of Wetterau; of the Mineralogical Society of Jena; of the Royal Mineralogical Soiety of Dresden; of the Natural History Society of Paris; of the Philomathic Society of Paris; of the Natural History Society of Calvados; of the Senkenberg Society of Natural History; of the Society of Natural Sciences and Medicine of Heidelberg; Honorary Member of the Literary and Philosophical Society of New York; of the New York Historical Society; of the American Antiquarian Society; of the Academy of Natural Sciences of Philadelphia; of the Lyceum of Natural History of New York; of the Natural History Society of Montreal; of the Franklin Institute of the State of Pennsylvania for the Promotion of the Mechanical Arts; of the Geological Society of Pennsylvania; of the Boston Society of Natural History of the United States; of the South African Institution of the Cape of Good Hope; Honorary Member of the Statistical Society of France; Member of the Entomological Society of Stettin, &c. &c. &c. OCTOBER 1848 .... APRIL 1849. VOL. XLVI. TO BE CONTINUED QUARTERLY. EDINBURGH: ADAM & CHARLES BLACK, EDINBURGH: LONGMAN, BROWN, GREEN, & LONGMANS, LONDON. 1849. CONTENTS. ART. I. The Life and Writings of LOUIS AGASSIZ, Doctor of Philosophy and Medicine, LL.D. of Edinburgh and Dublin, Knight of the Order of the Red Eagle of Prussia, formerly Professor of Natural History in the Academy of Neufchâtel, now Professor of II. Researches into the Effects of certain Physical and Chemical Agents on the Nervous System. By MARSHALL HALL, M.D., F.R.S., Foreign Asso- ciate of the Royal Academy of Medicine of Paris, &c. (With a Plate.) Communicated by the Au- thor. (Concluded from vol. xlv., p. 267.) SECTION II. On the Electrogenic Condition of the Spi- nal Marrow, and of the Incident Spinal Nerves:— PAGE IV. Anniversary Address, for 1848, to the Ethnological Society of London, on the recent Progress of Ethnology. By the President, JAMES COWLES PRICHARD, M.D., F.R.S., Corresponding Member of the Institute of France, &c. Communicated by the Ethnological Society. (Concluded from vol. V. On the Vegetation of the Carboniferous Period, as compared with that of the present day. By Dr HOOKER, Botanist to the Geological Survey of the XV. Fifteenth Letter on Glaciers; containing Observa- tions on the Analogies derived from Mud-Slides on a large Scale, and from some processes in the Arts, in favour of the Viscous Theory of Glaciers. Addressed to the Rev. Dr WHEWELL, by Professor |