The American Journal of Science, Bände 155-156J.D. & E.S. Dana, 1898 |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
acid albite ammonium amount amphibole analysis andesites angles appear beds boric acid carbon dioxide cathode cent chemical chloride color containing corundum Creek crystals deposits described developed diameter dike dunite electric electrode eruption evidence experiments feet feldspar figures force formation fossils fragments Geissler tube Geol geyser given gneiss gold grains grams granite growth heat hydrogen Ichthyodectes Island JOUR Journal Jurassic latites length limestone lines liquid magnetic manganese mass material meteorite method mineral molecules nearly O. C. MARSH observed obtained occur olivine original orthoclase oxide oxygen paper peridotites phenocrysts plagioclase plates portion powder precipitate present pressure produced Prof pyrite quartz reef region rhyolite rocks salt sandstone schists SCI.-FOURTH SERIES shales shell-heaps shown silicate solution spark species specimens spines strata sulphate sulphuric surface temperature theory thickness tion trachytes tube veins volume wave zone
Beliebte Passagen
Seite 395 - The Secretary of War, upon the request of the Secretary of the Interior, is hereby authorized and directed to make the necessary details of troops to prevent trespassers or intruders from entering the park for the purpose of destroying the game or objects of curiosity therein, or for any other purpose prohibited by law, and to remove such persons from the parks...
Seite 213 - ... permanganate used is so small as to make doubtful the presence of vanadium, it is necessary to apply a qualitative test, which is best made as follows: The solution is evaporated and heated to expel excess of sulphuric acid, the residue is taken up with 2 or 3...
Seite 50 - exhibit the following order of formations: 1. Chrysolitic rock somewhat mixed with anthophyllite ; 2. a layer of micaceous rock; 3. a seam of chalcedony ; 4. a stratum of chloritic rock (ripidolite) ; 5. the same through which the corundum is regularly diffused, sometimes in narrow veins or widening out to several feet.
Seite 187 - Reynolds's zigzag curve to be a spiral. This figure is, however, inadmissible, inasmuch as the curve has to pass through a point neutral as to electricity and chemical energy twice in each cycle.
Seite 212 - ... dryness. Care should be taken to avoid overrunning neutrality, because of the reducing action of the nitrous acid set free from the nitrite produced during fusion, but when chromium is present it has been my experience that some of this will invariably be retained by the precipitated silica and alumina, though only in one case have I observed a retention of vanadium, it being then large. The use...
Seite 209 - FA GOOCH AND MARTHA AUSTIN* THE estimation of manganese by the conversion of salts of that element with volatile acids to the form of the anhydrous sulphate by the action of an excess of sulphuric acid, evaporation, and gentle heating was formerly a recognized procedure. On the authority of...
Seite 352 - The history of a group of animals is the same. The first species are small and unornamented. They increase in size, complexity, and diversity, until the culmination, when most of the spinose forms begin to appear. During the decline, extravagant types are apt to develop, and if the end is not then reached, the group is continued in the small and unspecialized species, which did not partake of the general tendency to spinous growth.
Seite 118 - ... central island, while the atolls are similar flats from the surface of which the islands have at first disappeared and the interior parts of which have next been removed by the incessant scouring of the action of the sea, the ceaseless rollers pouring a huge mass of water into the lagoon, which finds its way out of the passages leading into it or over the low outer edges of the lagoon.
Seite 349 - ... immediate series or group reaches a high degree of exactitude, and that the observed phenomena of the life of an individual should enable us to explain, in some measure, the equivalent phenomena of the life of the group ; and we are unavoidably led to entertain the expectation that it does explain it. The evidence is very strong that there is a limit to the progressive complications which may take place in any type, beyond which it can only proceed by reversing the process, and retrograding....
Seite 331 - Viscosity must tend to the retention of steam within the basin and . . . explosive liberation must follow . . . Viscosity in these hot springs must also tend to the formation of bubbles and foam when the steam rises to the surface, and this in turn aids to bring about the explosive action, followed by a relief of pressure, and thus to hasten the final and more powerful display.