Proceedings of the American Association for the Advancement of Science, Volume 20, Part 1871 |
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Page iii
... Meteors , and their Long - enduring Trails . By JACOB ENNIS II . PHYSICS AND CHEMISTRY . 1. A Discussion on Perturbation of Forces . By JAMES D. WARNER 2. The Law of Electric Currents . By E. B. ELLIOTT . • 3. On some Improvements in ...
... Meteors , and their Long - enduring Trails . By JACOB ENNIS II . PHYSICS AND CHEMISTRY . 1. A Discussion on Perturbation of Forces . By JAMES D. WARNER 2. The Law of Electric Currents . By E. B. ELLIOTT . • 3. On some Improvements in ...
Page 104
... meteors which seem to be comets revolving in similar orbits , ply the filling up of the outlines of Copernicus . - all these are sim- The same is true of the era of Newton . When he had dis- covered that the force of gravity held the ...
... meteors which seem to be comets revolving in similar orbits , ply the filling up of the outlines of Copernicus . - all these are sim- The same is true of the era of Newton . When he had dis- covered that the force of gravity held the ...
Page 113
... meteorites . - - a The most remarkable fact in the constitution of the asteroid ring is this : through its outer , and therefore its first , space of 65,500,000 miles , there have yet been found only twenty - eight asteroids , nearly ...
... meteorites . - - a The most remarkable fact in the constitution of the asteroid ring is this : through its outer , and therefore its first , space of 65,500,000 miles , there have yet been found only twenty - eight asteroids , nearly ...
Page 115
... Meteors . And it was in this transition period of our solar nebula , between the production of these two different classes of bodies , that the rings forming the asteroids were abandoned , — rings vastly different from any others ...
... Meteors . And it was in this transition period of our solar nebula , between the production of these two different classes of bodies , that the rings forming the asteroids were abandoned , — rings vastly different from any others ...
Page 120
... meteors and meteorites are solved by the same theory , but a full discussion I must reserve for a separate paper . And here I must close this short review of the new and wide fields of research opened by the fourth era of modern as ...
... meteors and meteorites are solved by the same theory , but a full discussion I must reserve for a separate paper . And here I must close this short review of the new and wide fields of research opened by the fourth era of modern as ...
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Common terms and phrases
A. A. A. S. VOL acid Amer Association atmosphere axis beds bones Boston branchihyals burn Cambrian Cambridge carbonate centre Champlain division chemical Chicago chlorite coal Connecticut crystalline schists crystals deposits earth elements Emmons euglena fact feet formation Geol geological gneiss gravity Green Mountains hornblende Huronian Illinois 17 inches Indiana Indianapolis iron Jour latent heat Laurentian lime limestone living force magnesia mass Massachusetts Massachusetts 18 matter meteorites meteors miles mineral motion nebular theory observations Ohio orbits origin orthoclase outer oxygen paleozoic parallax Pennsylvania pharyngeals Philadelphia planetary planets Potsdam present prime vertical Professor pseudomorphism pyroxene region rocks rotation sandstone satellites schists sediments seen serpentine sidereal silicates Silurian slates solar nebula solar system stars steatite strata SUPERFAMILY superior pharyngeal supposed surface Taconic tion trails Troy tube unoxidized upper velocity Vermont vertebræ vertical William York 19 zenith distance
Popular passages
Page 13 - Roofingslate, graptolitic ; 6. Silicious conglomerate ; 7. Taconic slate ; 8. Black slate. The apparent order of superposition differs from this ; and it was conceived by Professor Emmons that, during the accumulation of these Taconic rocks, the Green Mountain gneiss, which formed the eastern border of the basin, was gradually elevated so as to bring successively the older members above the ocean from which the sediments were being deposited. From this it resulted that the upper members of the system,...
Page xv - 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 405 - Once there was a space of ten or twelve feet in height, by fifty or sixty feet in length, covered by these inscriptions. Most of them have been obliterated by the recent white settlers. In 1861, Dr. Salisbury took copies from a space about eight by fifteen feet, by laying a piece of coarse muslin over them, and tracing such as remain uninjured, life-size, on the cloth. In this space there are found to be twenty-three characters, most of which are the arrow-head or bird-track character.
Page 54 - ... of non-magnesian limestones; second, its artificial production by the direct union of carbonate of lime and hydrous carbonate of magnesia, at a gentle heat, in the presence of water. As to the sources of the hydrous magnesian carbonate, I have endeavored to show that it is formed from the magnesian chlorid, or sulphate of the sea, or other saline waters, in two ways : first, by the action of the bicarbonate of soda found in many natural waters ; this, after converting all soluble lime-salts into...
Page 45 - Pseudomorphism, which is the change of one mineral species into another by the introduction or the elimination of some element or elements, presupposes metamorphism ; since only definite mineral species can be the subjects of this process. To confound metamorphism with pseudomorphism, as Bischof, and others after him, have done, is therefore an error.
Page 236 - ... and are most marked on the smaller rivers, while apparently absent from those of the largest size, such as the Mississippi, Red, and Arkansas Rivers. The elevation at which, on the very Gulf shore, we find deposits of the Port Hudson age (180 feet at the Five Islands on Vermilion Bay) shows, nevertheless, that a stupendous amount of erosion was accomplished during the time that the Mississippi occupied in scooping out its channel to a depth which, even below the northern boundary of Louisiana,...
Page 11 - ... and trap. He declared, moreover, that there is no clear line of demarcation among the various schistose primary rocks ; and cited, as an illustration, the passage into each other of serpentine, steatite, and talcose schist. His description of the crystalline rocks of this range will be recognized as comprehensive and truthful. To the west of the hills of primary schist he placed his Taconic system, named from the Taconic hills, which run from north to south along the boundary line of New York...
Page 285 - ... and lists of the genera, recent and extinct. While the author has been dependent, for the most part, on the collections of the Smithsonian Institution for his investigations, he has also visited the museums of the Academy of Natural Sciences of Philadelphia, the Peabody Academy of Science of Salem, the Boston Society of Natural History, and the Museum of Comparative Zoology at Cambridge.
Page 303 - Teeth encased in enamel : incisors (f ; exceptionally, also two supplementary posterior teeth) continually reproduced from persistent pulps, and growing in a circular direction : canines null : molars attypically with ridged surfaces.
Page 431 - Association upon the following question: — Might not the present system of repeating the same lectures to the same classes during two successive terms be usefully modified by extending the lectures of each chair over two sessions, so as to embrace systematic and complete discussion of each of the following subjects?