Proceedings of the American Association for the Advancement of Science, Volume 20, Part 1871 |
Contents
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Common terms and phrases
A. A. A. S. VOL acid Amer Association axis basal Basis cranii beds bones branchihyals Cambrian Cambridge carbonate centre character chemical Chicago chlorite clay coal cranium crystalline schists crystals deposits developed distance earth elements Emmons Eozoön euglena feet force formation geological gneiss gravity Green Mountains hornblende Illinois 17 inches Indiana Indianapolis iron Jour latent heat lateral with spirals latter lime limestone magnesia mass Massachusetts Massachusetts 18 maxillary meteorites meteors miles mineral Mississippi motion nebular nebular theory nodes branchless observed Ohio orbits origin oscillaria paleozoic pectoral fins Pennsylvania pharyngeals planets portion Potsdam present prime vertical Professor pseudomorphism region rocks rotation sandstone schists Science sediments seen serpentine side silicates Silurian solar solar nebula stars strata SUBORDER SUPERFAMILY superior pharyngeal surface Taconic Terre Haute theory tion trails Troy tube upper velocity vertebræ vertical York 19 zenith
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?