Front Matter

The Committee appointed by the Royal Society to direct the publication of the Philosophical Transactions, take this opportunity to acquaint the Public, that it fully appears, as well from the Council-books and Journals of the Society, as from repeated declarations which have been made in several former Transactions, that the printing of them was always, from time to time, the single act of the respective Secretaries till the Forty-seventh Volume; the Society, as a Body, never interesting themselves any further in their publication, than by occasionally recommending the revival of them to some of their Secretaries, when, from the particular circumstances of their affairs, the Transactions had happened for any length of time to be intermitted. And this seems principally to have been done with a view to satisfy the Public, that their usual meetings were then continued, for the improvement of knowledge, and benefit of mankind, the great ends of their first institution by the Royal Charters, and which they have ever since steadily pursued. But the Society being of late years greatly enlarged, and their communications more numerous, it was thought advisable that a Committee of their members should be appointed, to reconsider the papers read before them, and select out of them such as they should judge most proper for publication in the future Transactions; which was accordingly done upon the 26th of March 1752. And the grounds of their choice are, and will continue to be, the importance and singularity of the subjects, or the advantageous manner of treating them; without pretending to answer for the certainty of the facts, or propriety of the reasonings, contained in the several papers so published, which must still rest on the credit or judgement of their respective authors. It is likewise necessary on this occasion to remark, that it is an established rule of the Society, to which they will always adhere, never to give their opinion, as a Body, upon any subject, either of Nature or Art, that comes before them. And therefore the thanks, which are frequently proposed from the Chair, to be given to the authors of such papers as are read at their accustomed meetings, or to the persons through whose hands they received them, are to be considered in no other light than as a matter of civility, in return for the respect shown to the Society by those communi- cations. The like also is to be said with regard to the several projects, inventions, and curiosities of various kinds, which are often exhibited to the Society; the authors whereof, or those who exhibit them, frequently take the liberty to report and even to certify in the public newspapers, that they have met with the highest applause and approbation. And therefore it is hoped that no regard will hereafter be paid to such reports and public notices; which in some instances have been too lightly credited, to the dishonour of the Society. A List of Public Institutions and Individuals, entitled to receive a copy of the Philosophical Transactions of each year, on making application for the same directly or through their respective agents, within five years of the date of publication. In the British Dominions. The King's Library. The Admiralty Library. The Radcliffe Library, Oxford. The Royal Geographical Society. The United Service Museum. The Royal College of Physicians. The Society of Antiquaries. The Linnean Society. The Royal Institution of Great Britain. The Society for the Encouragement of Arts. The Geological Society. The Horticultural Society. The Royal Astronomical Society. The Royal Asiatic Society. The Royal Society of Literature. The Medical and Chirurgical Society. The London Institution. The Entomological Society of London. The Zoological Society of London. The Institute of British Architects. The Institution of Civil Engineers. The Cambridge University Philosophical Society. The Royal Society of Edinburgh. The Royal Irish Academy. The Royal Dublin Society. The Asiatic Society at Calcutta. The Royal Artillery Library at Woolwich. The Royal Observatory at Greenwich. The Observatory at Dublin. The Observatory at Armagh. The Observatory at the Cape of Good Hope. The Observatory at Madras. The Observatory at Paramatta. The Observatory at Edinburgh. Denmark. The Royal Society of Sciences at Copenhagen. The Royal Observatory at Altona. France. The Royal Academy of Sciences at Paris. The Royal Academy of Sciences at Thoulouse. The École des Mines at Paris. The Geographical Society at Paris. The Entomological Society of France. The Dépôt de la Marine, Paris. The Geological Society of France. The Jardin des Plantes, Paris. Germany. The University at Göttingen. The Cæsarean Academy of Naturalists at Bonn. The Observatory at Manheim. Italy. The Italian Society of Sciences at Modena. The Royal Academy of Sciences at Turin. Switzerland. The Société de Phys. et d'Hist. Nat. at Geneva. Belgium. The Royal Academy of Sciences at Brussels. Netherlands. The Royal Institute of Amsterdam. Spain. The Royal Observatory at Cadiz. Portugal. The Royal Academy of Sciences at Lisbon. Prussia. The Royal Academy of Sciences at Berlin. Russia. The Imperial Academy of Sciences at St. Petersburg. Sweden and Norway. The Royal Academy of Sciences at Stockholm. The Royal Society of Sciences at Drontheim. United States. The American Philosophical Society at Philadelphia. The New York Philosophical Society. The American Academy of Sciences at Boston. The Library of Harvard College. The fifty Foreign Members of the Royal Society. A List of Public Institutions and Individuals, entitled to receive a copy of the Astronomical Observations made at the Royal Observatory at Greenwich, on making application for the same directly or through their respective agents, within two years of the date of publication. In the British Dominions. The King's Library. The Board of Ordnance. The Royal Society. The Savilian Library, Oxford. The Library of Trinity College, Cambridge. The King's Observatory at Richmond. The Royal Observatory at Greenwich. The University of Aberdeen. The University of St. Andrews. The University of Dublin. The University of Edinburgh. The University of Glasgow. The Observatory at Oxford. The Observatory at Cambridge. The Observatory at Dublin. The Observatory at Armagh. The Observatory at the Cape of Good Hope. The Observatory at Paramatta. The Observatory at Madras. The Royal Institution of Great Britain. The Royal Society, Edinburgh. The Astronomical Institution, Edinburgh. The President of the Royal Society. The Lowndes's Professor of Astronomy, Cambridge. The Plumian Professor of Astronomy, Cambridge. Francis Baily, Esq. V.P. and Treas. R.S. Thomas Henderson, Esq. of Edinburgh. John William Lubbock, Esq. Captain W. H. Smyth, R.N. of Bedford. Sir James South, Observatory, Kensington. In Foreign Countries. The Royal Academy of Sciences at Berlin. The Royal Academy of Sciences at Paris. The Imperial Academy of Sciences at St. Petersburg. The Royal Academy of Sciences at Stockholm. The Royal Society of Sciences at Upsal. The Board of Longitude of France. The University of Göttingen. The University of Leyden. The Academy of Bologna. The American Academy of Sciences at Boston. The American Philosophical Society at Philadelphia. The Library of Harvard College. The Observatory at Helsingfors. The Observatory at Altona. The Observatory at Berlin. The Observatory at Breslau. The Observatory at Brussels. The Observatory at Cadiz. The Observatory at Coimbra. The Observatory at Copenhagen. The Observatory at Dorpat. The Observatory at Königsberg. The Observatory at Manheim. The Observatory at Marseilles. The Observatory at Milan. The Observatory at Munich. The Observatory at Palermo. The Observatory at Paris. The Observatory at Seeberg. The Observatory at Vienna. The Observatory at Tubingen. The Observatory at Wilna. Professor Bessel, of Königsberg. Dr. William Olbers, of Bremen. The Dépôt de la Marine, Paris. The Bowden College, United States. The Waterville College, United States. ROYAL MEDALS. HER MAJESTY QUEEN VICTORIA, in restoring the Foundation of the Royal Medals, has been graciously pleased to approve of the following regulations for the award of them: That the Royal Medals be given for such papers only as have been presented to the Royal Society, and inserted in their Transactions. That the triennial Cycle of subjects be the same as that hitherto in operation: viz. 1. Astronomy; Physiology, including the Natural History of Organized Beings. 2. Physics; Geology and Mineralogy. 3. Mathematics; Chemistry. That, in case no paper, coming within these stipulations, should be considered deserving of the Royal Medal, in any given year, the Council have the power of awarding such Medal to the author of any other paper on either of the several subjects forming the Cycle, that may have been presented to the Society and inserted in their Transactions; preference being given to the subjects of the year immediately preceding: the award being, in such case, subject to the approbation of Her Majesty. The Council propose to give one of the Royal Medals in the year 1840 for the most important unpublished paper in Physics, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1837, and prior to the termination of the Session in June 1840. The Council propose also to give one of the Royal Medals in the year 1840 for the most important unpublished paper in Geology or Mineralogy, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1837, and prior to the termination of the Session in June 1840. The Council propose to give one of the Royal Medals in the year 1841 for the most important unpublished paper in Mathematics, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1838, and prior to the termination of the Session in June 1841. The Council propose also to give one of the Royal Medals in the year 1841 for the most important unpublished paper in Chemistry, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1838, and prior to the termination of the Session in June 1841. The Council propose to give one of the Royal Medals in the year 1842 for the most important unpublished paper in Astronomy, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1839, and prior to the termination of the Session in June 1842. The Council propose also to give one of the Royal Medals in the year 1842 for the most important unpublished paper in Physiology, including the Natural History of Organized Beings, communicated to the Royal Society for insertion in their Transactions after the termination of the Session in June 1839, and prior to the termination of the Session in June 1842. ADJUDICATION of the Medals of the Royal Society for the year 1838 by His Royal Highness the President and Council. The Rumford Medal to James David Forbes, Esq., F.R.S., for his "Experiments on the Polarization of Heat," published in the Transactions of the Royal Society of Edinburgh. A Copley Medal to Professor K. F. Gauss, For. Memb. R.S., for his "Inventions and Mathematical Researches on Magnetism." Another Copley Medal to Michael Faraday, Esq., D.C.L., F.R.S., for his "Researches on Specific Electrical Induction." The Royal Medal, in the department of Chemistry, to Thomas Graham, Esq., M.A., F.R.S., for his paper entitled "Inquiries respecting the Constitution of Salts, of Oxalates, Nitrates, Phosphates, Sulphates, and Chlorides," published in the Philosophical Transactions for 1836. The Royal Medal, in the department of Mathematics, to William Henry Fox Talbot, Esq., F.R.S., for his papers entitled "Researches in the Integral Calculus," published in the Philosophical Transactions for 1836 and 1837. CONTENTS. I. Experimental Researches in Electricity.—Fifteenth Series. By Michael Faraday, Esq., D.C.L. F.R.S. Fullerian Prof. Chem. Royal Institution, Corr. Memb. Royal and Imp. Acad. of Sciences, Paris, Petersburgh, Florence, Copenhagen, Berlin, Gottingen, Modena, Stockholm, &c. &c. . . . . . . . . . page 1 II. On the Application of the Conversion of Chlorates and Nitrates into Chlorides, and of Chlorides into Nitrates, to the determination of several equivalent numbers. By Frederick Penny, Esq. Communicated by H. Hennell, Esq. F.R.S. . . . . . . . . 13 III. Researches on the Chemical Equivalents of Certain Bodies. By Richard Phillips, F.R.S., &c. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 IV. Observations on the Parallel Roads of Glen Roy, and of other parts of Lochaber in Scotland, with an attempt to prove that they are of marine origin. By Charles Darwin, Esq., M.A. F.R.S. Sec. G.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 V. An Account of the Fall of a Meteoric Stone in the Cold Bokkeveld, Cape of Good Hope. By Thomas Maclear, Esq. F.R.S. &c., in a Letter to Sir John F. W. Herschel, Bart. V.P.R.S. &c. &c. Communicated by Sir J. F. W. Herschel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Chemical Account of the Cold Bokkeveld Meteoric Stone. By Michael Faraday, Esq. D.C.L. F.R.S. &c., in a Letter to Sir J. F. W. Herschel, Bart. V.P.R.S. &c. &c. Communicated by Sir J. F. W. Herschel, Bart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 VI. Fifth Letter on Voltaic Combinations, with some Account of the Effects of a large Constant Battery. Addressed to Michael Faraday, Esq. D.C.L. F.R.S., Fullerian Prof. Chem. Royal Institution, &c. &c. &c. By J. Frederic Daniell, Esq. F.R.S., Prof. Chem. in King's College, London . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 VII. On the Electrolysis of Secondary Compounds. In a Letter addressed to Michael Faraday, Esq. D.C.L. F.R.S., Fullerian Prof. Chem. Royal Institution, &c. &c. &c. By J. Frederic Daniell, Esq. F.R.S., Prof. Chem. in King's College, London . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 VIII. On a new Equiatomic Compound of Bicyanide with Binoxide of Mercury. By James F. W. Johnston, Esq. M.A. F.R.S., Professor of Chemistry and Mineralogy in the University of Durham IX. On the Constitution of the Resins. By James F. W. Johnston, Esq. M.A. F.R.S., Professor of Chemistry and Mineralogy in the University of Durham. X. On the Male Organs of some of the Cartilaginous Fishes. By John Davy, M.D. F.R.S., Assistant Inspector of Army Hospitals XI. Researches on the Tides.—Tenth Series. On the Laws of Low Water at the Port of Plymouth, and on the Permanency of Mean Water. By the Rev. W. Whewell, B.D. F.R.S., Fellow of Trinity College, Cambridge XII. Researches on the Tides.—Eleventh Series. On certain Tide Observations made in the Indian Seas. By the Rev. W. Whewell, B.D. F.R.S., Fellow of Trinity College, Cambridge XIII. Account of Experiments on Iron-built Ships, instituted for the purpose of discovering a correction for the deviation of the Compass produced by the Iron of the Ships. By George Biddell Airy, Esq. A.M. F.R.S., Astronomer Royal ADJUDICATION of the Medals of the Royal Society for the year 1839 by the President and Council. The Copley Medal to Robert Brown, Esq., D.C.L., F.R.S., for his discoveries, during a series of years, on the subject of Vegetable Impregnation. The Royal Medal, in the department of Astronomy, to James Ivory, Esq., K.H., F.R.S., for his paper entitled "On the theory of the Astronomical Refractions," published in the Philosophical Transactions for 1838. The Royal Medal, in the department of Physiology, including the Natural History of Organized Beings, to Martin Barry, M.D., for his papers entitled "Researches in Embryology," published in the Philosophical Transactions for 1838 and 1839. XIV. THE BAKERIAN LECTURE.—Inquiries concerning the Elementary Laws of Electricity.—Third Series. By W. Snow Harris, Esq. F.R.S. . . . . . page 215 XV. On the Conditions of Equilibrium of an Incompressible Fluid, the Particles of which are acted upon by Accelerating Forces. By James Ivory, K.H. M.A. F.R.S. L. & E., Instit. Reg. Sc. Paris, Corresp. et Reg. Sc. Gottn. Corresp. . . . 243 Note of Mr. Ivory relating to the correcting of an error in a Paper printed in the Philosophical Transactions for 1838, pp. 57, &c. . . . . . . . . 265 XVI. Report of a Geometrical Measurement of the Height of the Aurora Borealis above the Earth. By the Rev. James Farquharson, LL.D. F.R.S., Minister of the Parish of Alford. Communicated by Major Sabine, R.A. F.R.S. &c. . . . 267 XVII. On the Constitution of the Resins. Part II. By James F. W. Johnston, Esq. M.A., F.R.S., Professor of Chemistry and Mineralogy in the University of Durham. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 XVIII. On the Constitution of the Resins. Part III. By James F. W. Johnston, Esq. M.A., F.R.S., Professor of Chemistry and Mineralogy in the University of Durham. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XIX. Researches in Embryology.—Second Series. By Martin Barry, M.D. F.R.S.E., Fellow of the Royal College of Physicians in Edinburgh. Communicated by P. M. Roget, M.D. Sec. R.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 XX. Researches in Physical Geology. By W. Hopkins, Esq. M.A. F.R.S., Fellow of the Royal Astronomical Society, of the Geological Society, and of the Cambridge Philosophical Society.—First Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . 381 XXI. A Description of a Hydropneumatic Baroscope. By John Thomas Cooper, Esq. Communicated by William Thomas Brande, Esq. F.R.S. . . . . . . . . . . 425 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433 APPENDIX. Presents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [i] Meteorological Journal kept at the Apartments of the Royal Society, by order of the President and Council.