Philosophical Magazine: A Journal of Theoretical, Experimental and Applied Physics

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Taylor & Francis., 1885 - Science
 

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Page 91 - ... step that was taken, in any part of the county, looking to the education and general improvement of the people. Through this paper the farmers of the county were brought into closer touch with the work of the Institute and the influence of the school upon the community was strengthened and deepened. In fact, it would not be far from the truth to say that the Negro communities in Macon County have made more progress during the last five years than they did during the previous twenty-five. The...
Page 282 - Tuscorora" and "Challenger" have made known numerous submarine elevations : mountains rising from the general level of the ocean's bed, at a depth of 2500 or 3000 fathoms, up to within a few hundred fathoms of the surface.
Page 341 - Commission, when it ordered the killing of the "wild well." The object of the present paper is to give an account of the...
Page 270 - October 2, 1879, expresses his continued adherence to the opinion "that the atolls and barrier reefs in the middle of the Pacific and Indian Oceans indicate subsidence" ; and the letter of my friend Professor Judd, printed at the end of this article (which I had perhaps better say Professor Judd had not seen) will prove that this opinion remained unaltered to the end of his life.
Page 179 - ... we shall have, in passing from the outside to the centre, a series of strata in a more and more perfect crystalline condition. Light, as we know in the case of some bodies, tends to promote crystallization, and, when it falls on the surface of such a stick of selenium, probably tends to promote crystallization in the exterior layers, and therefore to produce a flow of energy from within outwards, which under certain circumstances appears, in the case of selenium, to produce an electric current....
Page 74 - Clwyd should also, in the author's opinion, be answered in the affirmative. The organic remains found in the different beds were briefly noticed, and then the faults of the district were discussed at some length. The principal faults run north and south, with an upthrow to the east, but are crossed by lines of fracture running east and •west. In conclusion, the correlation of the strata in the North Wales and Shrewsbury coal-fields, and especially of the coal-seams, with the beds found in other...
Page 283 - ... and solution within ; or, in the case of fringing reefs, that the change may go on until the reef has become a barrier-reef with an inner channel and inner reefs. It is admitted that subsidence may possibly have helped in the case of the deepest lagoons. Dr. Geikie expresses his opinion on the subject thus : — " As the atoll increases in size the lagoon becomes proportionally larger, partly from its waters being less supplied with pelagic food, and therefore less...
Page 291 - ... mountain-peak basement for the structure. The subsidence which the Darwinian theory requires has not been opposed by the mention of any fact at variance with it, nor by setting aside Darwin's arguments in its favour; and it has found new support in the facts from the Challenger's...
Page 183 - ... (3) The fact observed by Adams and Day that there is generally a " diminution of resistance in the selenium as the battery -power is increased." The same phenomenon occurs in the mixtures of sulphur and carbon before referred to. It points to the existence of imperfect contact between conducting particles, the conduction partaking of the nature of disruptive discharge, and is consistent with the supposition that particles of conducting selenide are imbedded in the selenium...
Page 300 - Our general aim in the book has been to place before the reader a description of a course of experiments which shall not only enable him to obtain a practical acquaintance with methods of measurement, but also as far as possible illustrate the more important principles of the various subjects.

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