The Birth-Time of the World and Other Scientific Essays

John Joly

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• Publié par: undru
• Publié le: 08 décembre 2010
• Nombre de lectures: 50
• Langue: English

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The Project Gutenberg EBook of The Birth-Time of the World and Other Scientific Essays, by J. (John) Joly This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: The Birth-Time of the World and Other Scientific Essays Author: J. (John) Joly Release Date: August 28, 2005 [EBook #16614] Language: English Character set encoding: ISO-8859-1 *** START OF THIS PROJECT GUTENBERG EBOOK THE BIRTH-TIME OF THE WORLD *** Produced by Hugh Rance THE BIRTH-TIME OF THE WORLD AND OTHER SCIENTIFIC ESSAYS by J. JOLY, M.A., Sc.D., F.R.S., PROFESSOR OF GEOLOGY AND MINERALOGY IN THE UNIVERSITY OF DUBLIN E. P. DUTTON AND COMPANY 681 FIFTH AVENUE NEW YORK Produced by Hugh Rance, 2005 Cover Title page CONTENTS PAGE I. THE BIRTH-TIME OF THE WORLD - - - - - - - - - - - 1 II. DENUDATION - - - - - - - - - - - - - - - - - - 30 - - - - - - - - - - - - 60 III. THE ABUNDANCE OF LIFE IV. THE BRIGHT COLOURS OF ALPINE FLOWERS - - - - - 102 V. MOUNTAIN GENESIS - - - - - - - - - - - - - - - 116 VI. ALPINE STRUCTURE - - - - - - - - - - - - - - - 146 VII. OTHER MINDS THAN OURS - - - - - - - - - - - - 162 VIII. THE LATENT IMAGE - - - - - - - - - - - - - - 202 IX. PLEOCHROIC HALOES - - - - - - - - - - - - - - 214 X. THE USE OF RADIUM IN MEDICINE - - - - - - - - - 244 XI. SKATING - - - - - - - - - - - - - - - - - - - 260 XII. A SPECULATION AS TO A PRE-MATERIAL UNIVERSE - 288 LIST OF ILLUSTRATIONS PLATE I. LAKE OF LUCERNE, LOOKING WEST FROM BRUNNEN Frontispiece PLATE II. "UPLIFTED FROM TITLIS, SWITZERLAND - to face p. 4 PLATE III. AN SWITZERLAND to face p. 31 ALPINE THE SEAS." CLIFFS OF THE TORRENT AT WORK—VAL D'HERENS, PLATE IV. EARTH PILLARS—VAL D'HERENS - to face p. 34 PLATE V. "SCENES OF DESOLATION." THE WEISSHORN SEEN FROM BELLA TOLA, SWITZERLAND - to face p. 40 PLATE VI. ALLUVIAL CONE—NICOLAI THAL, SWITZERLAND. MORAINE ON ALETSCH GLACIER SWITZERLAND - to face p. 50 PLATE VII. IN THE REGION OF THE CROCI; DOLOMITES. THE ROTHWAND SEEN FROM MONTE PIANO - to face p. 60 PLATE VIII. FIRS ASSAILING THE HEIGHTS OF THE MADERANER THAL, SWITZERLAND - to face p. 73 PLATE IX. LIFE NEAR THE SNOW LINE; THE BOG-COTTON IN POSSESSION. NEAR THE TSCHINGEL PASS, SWITZERLAND - to face p. 80 PLATE X. THE JOY OF LIFE. THE AMPEZZO THAL; DOLOMITES to face p. 93 PLATE XI. "PINES SOLEMNLY QUIET." DÜSSISTOCK; MADERANER THAL - to face p. 100 PLATE XII. ALPINE FLOWERS IN THE VALLEYS - to face p. 105 PLATE XIII. ALPINE FLOWERS ON THE HEIGHTS - to face p. 106 PLATE XIV. MOUNTAIN SOLITUDES; VAL DE ZINAL. FROM LEFT TO RIGHT ROTHHORN; BESSO; OBERGABELHORN; MATTERHORN; PIC DE ZINAL (THROUGH CLOUD); DENT BLANCHE - to face p. 116 ix PLATE XV. SECTOR OF THE EARTH RISE OF ISOGEOTHERMS INTO A DEPOSIT EVOLVING RADIOACTIVE HEAT - to face p. 118 PLATE XVI. "THE MOUNTAINS COME AND GO." THE DENT BLANCHE SEEN FROM THE SASSENEIRE - to face p. 133 PLATE XVII. DIAGRAMMATIC SECTIONS OF THE HIMALAYA - to face p. 140 PLATE XVIII. RESIDUES OF DENUDATION. THE MATTERHORN SEEN FROM THE SUMMIT OF THE ZINAL ROTHHORN - to face p. 148 PLATE XIX. THE FOLDED ROCKS OF THE MATTERHORN, SEEN FROM NEAR HÖHBALM. SKETCH MADE IN 1906 - to face p. 156 PLATE XX. SCHIAPARELLI'S MAP ADDITIONS (IN RED) OF 1892 - to face p. 166 PLATE XXI. GLOBE SATELLITE to face p. 188 OF MARS OF MARS OF 1882, AND SHOWING PATH OF IN-FALLING PLATE XXII. CANALS MAPPED BY LOWELL COMPARED WITH CANALS FORMED BY IN-FALLING SATELLITES - to face p. 192 PLATE XXIII. HALOES IN MICA; CO. CARLOW. HALO IN BIOTITE CONTAINED IN GRANITE - to face p. 224 PLATE XXIV. RADIUM HALO, MUCH ENLARGED. THORIUM HALO AND RADIUM HALO IN MICA - to face p. 228 PLATE XXV. HALO ROUND CAPILLARY IN GLASS TUBE. HALOES ROUND TUBULAR PASSAGES IN MICA - to face p. 230 PLATE XXVI. ALETSCH GLACIER, SWITZERLAND - to face p. 282 PLATE XXVII. THE MIDDLE ALETSCH GLACIER JOINING THE GREAT ALETSCH GLACIER. GLACIERS OF THE LAUTERBRUNNEN THAL - to face p. 285 PLATE XXVIII. PERCHED BLOCK ON THE ALETSCH GLACIER. GRANITE ERRATIC NEAR ROUNDWOOD, CO. WICKLOW; NOW BROKEN UP AND REMOVED to face p. 286 And Fifteen Illustrations in the Text. x PREFACE Tins volume contains twelve essays written at various times during recent years. Many of them are studies contributed to Scientific Reviews or delivered as popular lectures. Some are expositions of views the scientific basis of which may be regarded as established. Others—the greater number—may be described as attempting the solution of problems which cannot be approached by direct observation. The essay on The Birth-time of the World is based on a lecture delivered before the Royal Dublin Society. The subject has attracted much attention within recent years. The age of the Earth is, indeed, of primary importance in our conception of the longevity of planetary systems. The essay deals with the evidence, derived from the investigation of purely terrestrial phenomena, as to the period which has elapsed since the ocean condensed upon the Earth's surface. Dr. Decker's recent addition to the subject appeared too late for inclusion in it. He finds that the movements (termed isostatic) which geologists recognise as taking place deep in the Earth's crust, indicate an age of the same order of magnitude xi as that which denudative history.[1] is inferred from the statistics of The subject of _Denudation_ naturally arises from the first essay. In thinking over the method of finding the age of the ocean by the accumulation of sodium therein, I perceived so long ago as 1899, when my first paper was published, that this method afforded a means of ascertaining the grand total of denudative work effected on the Earth's surface since the beginning of geological time; the resulting knowledge in no way involving any assumption as to the duration of the period comprising the denudative actions. This idea has been elaborated in various publications since then, both by myself and by others. "Denudation," while including a survey of the subject generally, is mainly a popular account of this method and its results. It closes with a reference to the fascinating problems presented by the inner nature of sedimentation: a branch of science to which I endeavoured to contribute some years ago. _Mountain Genesis_ first brings in the subject of the geological intervention of radioactivity. There can, I believe, be no doubt as to the influence of transforming elements upon the developments of the surface features of the Earth; and, if I am right, this source of thermal energy is mainly responsible for that local accumulation of wrinkling which we term mountain chains. The [1] Bull. Geol. Soc. America, vol. xxvi, March 1915. xii paper on _Alpine Structure_ is a reprint from "Radioactivity and Geology," which for the sake of completeness is here included. It is directed to the elucidation of a detail of mountain genesis: a detail which enters into recent theories of Alpine development. The weakness of the theory of the "horst" is manifest, however, in many of its other applications; if not, indeed, in all. The foregoing essays on the physical influences affecting the surface features of the Earth are accompanied by one entitled _The Abundance of Life._ This originated amidst the overwhelming presentation of life which confronts us in the Swiss Alps. The subject is sufficiently inspiring. Can no fundamental reason be given for the urgency and aggressiveness of life? Vitality is an ever-extending phenomenon. It is plain that the great principles which have been enunciated in explanation of the origin of species do not really touch the problem. In the essay —which is an early one (1890)—the explanation of the whole great matter is sought—and as I believe found—in the attitude of the organism towards energy external to it; an attitude which results in its evasion of the retardative and dissipatory effects which prevail in lifeless dynamic systems of all kinds. _Other Minds than Ours_? attempts a solution of the vexed question of the origin of the Martian "canals." The essay is an abridgment of two popular lectures on the subject. I had previously written an account of my views which carried the enquiry as far as it was in xiii my power to go. This paper appeared in the "Transactions of the Royal Dublin Society, 1897." The theory put forward is a purely physical one, and, if justified, the view that intelligent beings exist in Mars derives no support from his visible surface features; but is, in fact, confronted with fresh difficulties. _Pleochroic Haloes_ is a popular exposition of an inconspicuous but very beautiful phenomenon of the rocks. Minute darkened spheres—a microscopic detail—appear everywhere in certain of the rock minerals. What are they? The discoveries of recent radioactive research—chiefly due to Rutherford—give the answer. The measurements applied to the little objects render the explanation beyond question. They turn out to be a quite extraordinary record of radioactive energy; a record accumulated since remote geological times, and assuring us, indirectly, of the stability of the chemical elements in general since the beginning of the world. This assurance is, without proof, often assumed in our views on the geological history of the Globe. Skating is a discourse, with a recent addition supporting the original thesis. It is an illustration of a common experience—the explanation of an unimportant action involving principles the most influential considered as a part of Nature's resources. The address on _The Latent Image_ deals with a subject which had been approached by various writers before the time of my essay; but, so far as I know, an explanation xiv based on the facts of photo-electricity had not been attempted. Students of this subject will notice that the views expressed are similar to those subsequently put forward by Lenard and Saeland