The American Journal of ScienceJ.D. & E.S. Dana, 1897 |
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Häufige Begriffe und Wortgruppen
Ameghino Ammonites analysis Arkansas basal bowlders calorimeter Cape Fairweather carapace carbon Carboniferous cent characters cleavage coil color Comanche Series Comet Creek condenser containing Cretaceous crystals deposits described determined developed diopside discharge electric Eocene error experiments fauna feet figures flame flask formation fossil genera genus Geol Geological Geologist Gryphaa heat inductances iodic acid iodine Journal Jurassic known leucite limestone Linuparus lower magma method mica mineral Miocene Mysidacea Neocomian Nimravus observed obtained oölite oxide oxygen paper Patagonian beds petrography phlogopite pitcheri plates posterior present pressure Professor Marcou Protoceras Pyrotherium pyroxene region resistance rhombohedron River rock sandstone sanidine Santa Cruz beds scapolite SCI.-FOURTH SERIES seen shown silica skull Smilodon sodium solution species specimens strata structure stylolites substance surface Syncarida temperature Tertiary Texas thickness tion Trinil tube Tucumcari Tucumcarii upper valley volume wire wyomingite
Beliebte Passagen
Seite 384 - ... founded on a view of the constitution of the chemical elements which has been favourably entertained by many chemists: this view is that the atoms of the different chemical elements are different aggregations of atoms of the same kind. In the form in which this hypothesis was enunciated by Prout, the atoms of the different elements were hydrogen atoms; in this precise form the hypothesis is not tenable, but if we substitute for hydrogen some unknown primordial substance X, there is nothing known...
Seite 369 - The tube of this funnel reaches nearly to the bottom of the flask and is drawn out at the lower end. A disc of platinum foil is hung in the neck of the flask, nearly closing it, and held in place by a platinum wire passing through the foil and tucked under the rubber stopper where the funnel tube enters. The second hole of the stopper is filled by the exit tube, a glass tube of 0.7 cm.
Seite 379 - Dalton's law. — The pressure of a mixture of several gases in a given space is equal to the sum of the partial pressures which each gas would exert if it were confined alone in the space.
Seite 473 - Remarks upon two species of deer of the genus Cervus from the Philippine Archipelago, by DU Elliot.
Seite 352 - Tertiary rocks that lap over and across it in such a manner as to give it the appearance of...
Seite 372 - WAY. flask was then connected with the wash bottle, using a thick solution of metaphosphoric acid to lute the joint between the flask and its stopper. The absorption apparatus was charged with a dilute solution of sodium hydroxide. Carbon dioxide was generated in a Kipp generator by the action of hydrochloric acid on marble and purified from reducing matter by bubbling through a strong solution of iodine in potassium iodide and finally washed with a solution of potassium iodide alone. A slow stream...
Seite 139 - Knob, a mesa about 6 miles northwest of Rock Springs, Wyo. Cross defines Madupite "as consisting essentially of diopside and a magnesia-potash mica with leucite in decidedly subordinate amount. Its magma is low in silica, alumina and iron, rich in potash, and contains so much lime and magnesia that silicates of these bases are the principal constituents, yet controlled in their development by the strong potash element.
Seite 384 - The carrier, then, must be small compared with ordinary molecules. The two fundamental points about these carriers seem to me to be (1) that these carriers are the same whatever the gas through which the discharge passes, (2) that the mean free paths depend upon nothing but the density of the medium traversed by these rays.
Seite 169 - ... started by a blow is damped more rapidly than if the jet were not ignited. Partly in consequence of the peculiar behaviour of flames and partly for other reasons, the thorough explanation of these phenomena is a matter of some difficulty ; but there can be no doubt that they fall under the head of vibrations maintained by heat, the heat being communicated periodically to the mass of air confined in the sounding tube at a place where, in the course of a vibration, the pressure varies. Although...
Seite 370 - Bevan,* a mixture of chromic and sulphuric acids may be safely heated without the disengagement of oxygen gas. Water is then run in until the crystals of chromic anhydride have disappeared and the danger of the evolution of oxygen is past. The solution is heated to its boiling point, care being taken that it shall not get under pressure, which can easily be observed by opening momentarily the stop-cock of the funnel tube and noting the direction of the flow of water, contained in the funnel. The...