The American Journal of Science, 151–152. köideJ.D. & E.S. Dana, 1896 |
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Common terms and phrases
albite alkali amount angle apparatus appears augite axis basal beds biotite boiling breccias carbon cent character chloride clays cleavage cm³ color colorless composition containing Creek Cretaceous crystals deposits described determined developed diameter dike Dinictis Eocene error ether evidence experiments fauna feet feldspar FIGURE flask flora formation fossils gabbro genus Geol geological gravity herapathite Hoplophoneus hornblende hydrochloric acid indicate iodine iron Journal Jurassic lake latter lava length leucite light limestone liquid magnet mass measured metallic method miles mineral mixture molecules mountains nearly observed obtained occur orthoclase oxide paper phenocrysts plane plate polybasite portion position posterior potassium iodide present Prof pyroxene quartz rays refraction region ridge River rock Röntgen SCI.-FOURTH SERIES selenious acid selenium shonkinite shown skull sodium solution species specific gravity specimens strata structure surface temperature thickness tion tube viscosity X-rays zone
Popular passages
Page 156 - ... barracks, is not sufficiently great to satisfactorily account for the great discomfort which such conditions produce in many persons, and there is no evidence to show that such an amount of change in the normal proportion of these gases has any influence upon the increase of disease and death-rates which statistical evidence has shown to exist among persons living in crowded and unventilated rooms.
Page 439 - Palaeontology, one to which my attention was drawn several years since, namely : the comparative value of different groups of fossils in marking geological time. In examining the subject with some care, I found that, for this purpose, plants, as their nature indicates, are most unsatisfactory witnesses; that invertebrate animals are much better ; and that vertebrates afford the most reliable evidence of climatic and other geological changes. The subdivisions of the latter group, moreover, and in...
Page 246 - Hence in a medium in which waves are propagated there is a pressure in the direction normal to the waves and numerically equal to the energy in unit volume.
Page 154 - The injurious effects of such airobserved appeared to be due entirely to the diminution of oxygen, or the increase of carbonic acid, or to a combination of these two factors. They also make it very improbable that the minute quantity of organic matter contained in the air expired from human lungs has any deleterious influence upon men who inhale it in ordinary rooms, and, hence, it is probably unnecessary to take this factor into account in providing for the ventilation of such rooms.
Page 211 - ... it is thought highly probable that under sufficient pressure and at a high temperature there are all gradations between heated waters containing mineral material in solution and a inagma containing water in solution.
Page 418 - ... chloride was added in a very little water, a mixture of equal proportions of ether and strong hydrochloric acid was introduced, the liquid was saturated at 15° with gaseous hydrochloric acid, more ether was added to secure complete miscibilily, and more gas passed to perfect saturation. The aluminium chloride was collected upon asbestos in a perforated crucible, washed with a mixture of ether and aqueous HC1 thoroughly saturated with the gaseous acid, dried at 150° C.
Page 439 - The boundary line between the Cretaceous and Tertiary in the region of the Rocky Mountains has been much in dispute during the last few years, mainly in consequence of the uncertain geological bearings of the fossil plants found near this horizon. The accompanying invertebrate fossils have thrown little light on the question, which is essentially, whether the great Lignite series of the West is uppermost Cretaceous, or lowest Eocene. The evidence of the numerous vertebrate remains is, in my judgment,...
Page 474 - ... degree of exhaustion of the gas in discharge tube. To judge from the nature of the discharge, I have worked at about the same pressure, but occasionally at greater or smaller pressures. I find, using a Weber's photometer, that the intensity of the fluorescent light varies nearly as the inverse square of the distance between screen and discharge tube. This result is obtained from three very consistent sets of observations at distances of 100 and 200 mm.
Page 155 - ... connected with dust particles which could be removed by a filter. They also showed that in this dust there were micro-organisms, including some of the bacteria which produce inflammation and suppuration, and it is probable that these were the only really dangerous elements in this air.
Page 255 - Copepoda, and also in many of the Cladocera and Cirrepedia, where no special respiratory organs are developed. The fringes on the exopodites in Triarthrus and Trinucleus are made up of narrow, oblique, lamellar elements becoming filiform at the ends. Thus they presented a large surface to the external medium, and partook of the nature of gills. But, as Gegenbaur says, "the functions of respiration and of locomotion are often so closely united that it is difficult to say whether certain forms of these...