The American Journal of Science and ArtsS. Converse, 1859 |
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Página 10
... obtained . An examination of the back of the drift shows that if workings should be resumed here , a rich harvest , for the mineralogist at least , would be gathered , the veinstone being highly crystalline in its texture . The ...
... obtained . An examination of the back of the drift shows that if workings should be resumed here , a rich harvest , for the mineralogist at least , would be gathered , the veinstone being highly crystalline in its texture . The ...
Página 11
... obtained in the copper re- gion were from the Old Copper Falls mine , a locality which has long ceased to be worked ; and no other has furnished any speci- mens to compare with those found here . The predominating form in these groups ...
... obtained in the copper re- gion were from the Old Copper Falls mine , a locality which has long ceased to be worked ; and no other has furnished any speci- mens to compare with those found here . The predominating form in these groups ...
Página 13
... obtained , without reject- ing any considerable amount of the stuff which is quarried out , were it desirable to ship a perfectly pure ore . The average yield of the ore shipped would , in point of fact , fall but little below that ...
... obtained , without reject- ing any considerable amount of the stuff which is quarried out , were it desirable to ship a perfectly pure ore . The average yield of the ore shipped would , in point of fact , fall but little below that ...
Página 14
... obtain a weighable amount of alumina . The oxygen was therefore determined by the loss , as giving more accurate results than could be obtained by the process of reduc- tion with hydrogen . It appears , therefore , that these ores are ...
... obtain a weighable amount of alumina . The oxygen was therefore determined by the loss , as giving more accurate results than could be obtained by the process of reduc- tion with hydrogen . It appears , therefore , that these ores are ...
Página 15
... obtained by me on Michipicoten island in 1853 , are in coarsely crystallized calcite , and form nodules having a structure in concentric layers . The portions selected for analy- sis appeared perfectly homogeneous and had almost exactly ...
... obtained by me on Michipicoten island in 1853 , are in coarsely crystallized calcite , and form nodules having a structure in concentric layers . The portions selected for analy- sis appeared perfectly homogeneous and had almost exactly ...
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Outras edições - Ver tudo
Palavras e frases frequentes
acetic acetic acid action altitude ammonia animal appears arm-plates arms Aurora auroral light beds bicarbonate carbonate of lime carbonate of magnesia carbonic acid chemical chemical affinity chlorid coal coast color containing copper crystalline crystals decomposed decomposition deposits dilute dissolved dolomite east fact feet Flathead River force formation fossils gallic acid geological gypsum heat hydrochloric acid inch iron Kootanie Lake lava light limestone magnesia magnetic manganese mass meteoric miles mineral mountains mouth-shields nearly observed obtained occur odor Ophiura origin oxyd oxygen papillæ passed phenomena pieces plants plates portion potash precipitate present Prof quantity radials remarkable river rocks salt sand sandstone SECOND SERIES seen side silicic silicic acid soda soil soluble solution species specimens strata streamers substance sulphate of lime sulphate of magnesia sulphuric acid surface tain temperature thick tion torsion tube vapor weight XXVIII zirconium
Passagens conhecidas
Página 128 - The Geology of Pennsylvania. A Government survey, with a general view of the Geology of the United States, Essays on the Coal Formation and its Fossils, and a description of the Coal Fields of North America and Great Britain.
Página 72 - He also says, deciding from analogy but in the absence of experimental data, and erroneously, " the ammonia absorbed by the clay or ferruginous oxyds is separated by every shower of rain, and conveyed in solution to the soil.
Página 285 - There was nothing to indicate that the different objects in the roof-breccia were other than of contemporaneous origin. Subsequently a great physical alteration in the contour, altering the flow of superficial water, and of the subterranean springs, changed all the conditions previously existing, and emptied out the whole, of the loose incoherent contents, leaving only the portions agglutinated to the roof. The wreck of these ejecta was visible in the patches of "cinere impastate," containing fossil...
Página 193 - Agassiz maintains, substantially, that each species originated where it now occurs, probably in as great a number of individuals occupying as large an area, and generally the same area, or the same discontinuous areas, as at the present time.
Página 158 - The Birds | of | North America ; | the descriptions of species based chiefly on the collections | in the | Museum of the Smithsonian Institution.
Página 108 - I was struck with the similarity of these bead-like strings to the fibrillae of the muscle, and upon close comparison I found that the former were exactly of the same size, and had the same optical properties as the latter. Some of these appeared to be attached to the ends of the flat, ribbon-like fibres, and others at times loosened themselves and swam away. I was immediately impressed with the daring thought, that these Vibrios were the...
Página 196 - Calamus, — besides an elm and a Ceanothus doubtfully referable to existing species, — on the Mississippi, near Columbus, Kentucky, in beds which Mr. Lesquereux regards as anterior to the drift. Professor DD Owen has indicated their position " as about 120 feet lower than the ferrugineous sand in which the bones of the Megalonyx Jeffersonii were found.
Página 301 - Geology, &c. 24 pp. 8vo, •with 4 progress maps. — This is the annual report showing the progress made in the several important scientific trusts comprised in the Jermyn St. establishment now under the general direction of Sir RI Murchison. 8. Experimental Researches relative to Corroval and Vao ; two new varieties of Woorara, the South American Arrow-Poison ; by WILLIAM A.
Página 85 - The great beneficent law regulating these absorptions appears to admit of the following expression : those bodies which are most rare and precious to the growing plant are by the soil converted into, and retained in, a condition riot of absolute, but of relative insolubility, and are kept available to the plant by the continual circulation in the soil of the more abundant saline matters.
Página 154 - Aurelia flavidula, our common jelly-fish, I observed that the whole component mass of cells was in violent agitation, each cell dancing zigzag about •within the plane of the wall. If any one will shake about a single layer of shot in a flat pan he can obtain an approximate idea of the appearance of this moving mass. In a perfectly healthy condition these cells lie closely side by side, and do not move individually from place to place, but yet are active on one side, which constitutes the surface...