Proceedings of the American Association for the Advancement of Science, Issue 9

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1856
 

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Page xv - The objects of the Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science In different parts of America, to give a stronger and more general impulse and more systematic direction to scientific research, and to procure for the labors of scientific men increased facilities and a wider usefulness.
Page 207 - WHITNEY. THE object of the present communication is to call attention to the geological position and mode of occurrence of one of the most interesting and important classes of the ores of iron, namely, those which are associated with rocks of the azoic system. The term Azoic, first...
Page 70 - Each candidate is to send his exercise privately: each is to have some motto prefixed; and to be accompanied by a paper sealed up, with the same motto on the outside; which paper is to enclose another, folded up, having the candidate's name and college written within. The papers containing the names of those persons who do not succeed are destroyed unopened.
Page 175 - In my reply to this letter Macomber's well was mentioned, and certain observations and experiments suggested, which it was thought might tend towards the solution of the problem. In the second letter of Mr. Corning, he writes as follows : — • " The deep well spoken of by Macomber is situated at some distance west of the village proper, about a quarter of a mile from Owego Creek, and is on rather high ground ; but no hills or mountains of any height are in its vicinity. The water of this well...
Page 69 - PRIZE," be awarded every two years to the author of the best Essay on some subject of Pure Mathematics, Astronomy, or other branch of Natural Philosophy. 2. That the...
Page 107 - ... centre of the cube, and their bases against the steel plates. In the case where rigid equable pressure is employed, as in that of the thick steel plate, all parts must give way together. But in that of a yielding equable pressure, as in the case of interposed lead, the stone first gives way along the lines of least resistance, and the remaining pressure must be sustained by the central portions around the vertical axis of the cube. After this important fact was clearly determined, lead and all...
Page 215 - ... least. Whenever a garnet or a lump of quartz was imbedded in compact feldspar, and favorably presented to the action of the sand, the feldspar was cut away around the hard mineral, which was thus left standing in relief above the general surface.
Page 110 - This marble, with many other specimens, was submitted to the freezing process fifty times in succession. It generally remained in the freezing mixture for twenty-four hours, but sometimes was frozen twice in the same day. The quantity of material lost was '00315 parts of an ounce. On these data Captain Meigs has founded an interesting calculation, which consists in determining the depth to which the exfoliation extended below the surface as the effect of its having been frozen fifty times. He found...
Page 248 - ... stocks, were sickly, feeble, thin, with frightful scars and skin diseases, and scrofula stamped on every feature and every visible part of the body. Here was hybridity of...
Page 103 - Though the art of building has been practised from the earliest times, and constant demands have been made, in every age, for the means of determining the best materials, yet the process of ascertaining the strength and durability of stone appears to have received but little definite scientific attention, and the commission, who...

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