The American Journal of Science and ArtsS. Converse, 1859 |
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Resultados 1-5 de 69
Página 22
... covered with thick forests , & c . , has been also generally aban- doned as contradicted by general evidence . The reasons against it may be briefly enumerated . They are found : 1. In the strati- fication of the coal measures ; and ...
... covered with thick forests , & c . , has been also generally aban- doned as contradicted by general evidence . The reasons against it may be briefly enumerated . They are found : 1. In the strati- fication of the coal measures ; and ...
Página 23
... covered with water when they fall on the ground , is due to the agency of a moss , the sphagnum which extends its compact tufts al- ways saturated with water like a sponge , over every fragment of wood , from the smallest to the largest ...
... covered with water when they fall on the ground , is due to the agency of a moss , the sphagnum which extends its compact tufts al- ways saturated with water like a sponge , over every fragment of wood , from the smallest to the largest ...
Página 24
... covering old deposits of peat or combusti- ble matter to a depth of from six to eight feet . The entire mass ... covered has formed the coal , and the woody matter floating in water above it has been mixed with mud and formed the ...
... covering old deposits of peat or combusti- ble matter to a depth of from six to eight feet . The entire mass ... covered has formed the coal , and the woody matter floating in water above it has been mixed with mud and formed the ...
Página 25
... covered it most of the time . Hence it follows ; that if the coal has been formed in marshes like our peat bogs , we ought necessarily to admit of a submergence and therefore of a subsidence of the land after each deposit of woody ...
... covered it most of the time . Hence it follows ; that if the coal has been formed in marshes like our peat bogs , we ought necessarily to admit of a submergence and therefore of a subsidence of the land after each deposit of woody ...
Página 26
... covered by the sandstone . There is scarcely a vein of coal worked to any great extent , that does not show a great diversity in the thickness , density and color of its roof shales . Hence the necessity of roofing differ- ently the ...
... covered by the sandstone . There is scarcely a vein of coal worked to any great extent , that does not show a great diversity in the thickness , density and color of its roof shales . Hence the necessity of roofing differ- ently the ...
Índice
1 | |
8 | |
21 | |
37 | |
48 | |
55 | |
66 | |
74 | |
246 | |
256 | |
259 | |
270 | |
276 | |
283 | |
292 | |
298 | |
85 | |
96 | |
109 | |
119 | |
128 | |
144 | |
154 | |
166 | |
187 | |
200 | |
206 | |
216 | |
227 | |
233 | |
305 | |
320 | |
346 | |
354 | |
365 | |
383 | |
394 | |
409 | |
431 | |
436 | |
444 | |
452 | |
453 | |
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...