Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy & C

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433 페이지 - ... and by that name may sue and be sued, plead and be impleaded, appear, prosecute and defend, in any court of law or equity...
155 페이지 - On this difficult and mysterious subject a work will very shortly appear, by Mr. Charles Darwin, the result of twenty years of observation and experiments in Zoology, Botany, and Geology, by which he has been led to the conclusion, that those powers of nature which give rise to races and permanent varieties in animals and plants, are the same as those which, in much longer periods, produce species, and, in a still longer series...
86 페이지 - Post 8vo. 8s. 6d. (FC) Principles of Athenian Architecture, and the Optical Refinements exhibited in the Construction of the Ancient Buildings at Athens, from a Survey. With 40 Plates. Folio. 61. 5s. PERCY'S (JOHN, MD) Metallurgy; or, the Art of Extracting Metals from their Ores and adapting them to various purposes of Manufacture.
98 페이지 - Gash veins may cross the strata at any angle ; but are limited to one particular group of strata, and are peculiar to the unaltered sedimentary rocks. True veins are aggregations of mineral matter, accompanied by metalliferous ores, within a crevice or fissure which had its origin in some deepseated cause, and which may be presumed to extend for an indefinite distance downwards. True veins are almost universally admitted by geologists to have originated in
374 페이지 - ... and that cold shortness resulted from the presence of a like quantity of phosphorus ; it therefore became necessary to remove those substances. Steam and pure hydrogen gas were tried with more or less success in the removal of sulphur, and various fluxes composed chiefly of silicates of the oxide of iron and manganese, were brought in contact with the fluid metal during the process, and the quantity of phosphorus was thereby reduced. Thus many months were consumed in laborious and expensive experiments;...
252 페이지 - An adequate Amount of Ventilation shall be constantly produced at all Collieries to dilute and render harmless noxious Gases to such an Extent as that the working Places of the Pits and Levels of such Collieries shall under ordinary Circumstances be in a fit State for working : 2.
153 페이지 - I have thus failed to obtain satisfactory evidence in favor of the remote origin assigned to the human fossils of Le Puy, I am fully prepared to corroborate the conclusions which have been recently laid before the Royal Society by Mr. Prestwich, in regard to the age of the flint implements associated in undisturbed gravel, in the North of France, with the bones of elephants at Abbeville and Amiens. These were first noticed at Abbeville, and their true geological position assigned to them by M. Boucher...
154 페이지 - France — slow movements of upheaval and subsidence, deranging but not wholly displacing the course of the ancient rivers. Lastly, the disappearance of the elephant, rhinoceros, and other genera of quadrupeds now foreign to Europe, implies, in like manner, a vast lapse of ages, separating the era in which the fossil implements were framed, and that of the invasion of Gaul by the Romans.
152 페이지 - Faleoner, of the Brixham Cave, must, I think, have prepared you to admit that scepticism in regard to the cave-evidence in favour of the antiquity of man had previously been pushed to an extreme.
154 페이지 - ... level of the Somme, for the deposition of fine sediment including entire shells, both terrestrial and aquatic, and also for the denudation which the entire mass of stratified drift has undergone, portions having been swept away, so that what remains of it often terminates abruptly in old river-cliffs, besides being covered by a newer unstratified drift. To explain these changes I should infer considerable oscillations in the level of the land in that part of France— slow movements of upheaval...

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