 | 1851 - 510 páginas
...as easily as bread unbaked. The feldspar appears to be converted partly into alum. In the meantime, the boulders and angular fragments brought down the...is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cementation yields. The thermal action on wood in this... | |
 | 1852 - 446 páginas
...evolved, water appears to be suddenly formed, beautiful crystals of sulphur deposited, (not sublimed as by fire,) and more or less sulphuric acid generated....is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cementation yields. " The thermal action on wood in this... | |
 | 1851 - 520 páginas
...as easily as bread unbaked. The feltspar appears to be converted partly into alum. In the meantime, the boulders and angular fragments brought down the...conglomerate, so that it is difficult to dislodge even a single pebble, the pebble itself sometimes breaking before the cementation yields. The thermal action... | |
 | 1852 - 460 páginas
...The rocks around you are rapidly dissolving under the powerful metamorphic action going on. Porpnyry and jasper are transformed into a kind of potter's...I discovered the stump of a large tree, silicified ; in another, a log changed to lignite or brown coal: Other fragments appeared midway between petrifaction... | |
 | 1853 - 336 páginas
...as easily as bread unbaked. The feldspar appears to be converted partly into alum. In the meantime the boulders and angular fragments brought down the...is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cementation yields. " The thermal action on wood in this... | |
 | John Russell Bartlett - 1854 - 732 páginas
...into alum. In the mean time the boulders and angular fragments brought down the ravines and river by floods are being cemented into a firm conglomerate...is difficult to dislodge even a small pebble, the pebble itself breaking before the conglomerate yields. " The thermal action on wood in this place is... | |
 | Edward Hitchcock, Charles Henry Hitchcock - 1860 - 442 páginas
...into alum. In the meantime the bowlders and angular fragments brought down the ravine and river by floods, are being cemented into a firm conglomerate,...is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cementation yields." Mr. Shepherd adds: " the metamorpliic... | |
 | Edward Hitchcock, Charles Henry Hitchcock - 1862 - 434 páginas
...into alum. In the meantime the bowlders and angular fragments brought down the ravine and river by floods, are being cemented into a firm conglomerate,...is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cementation yields." Mr. Shepherd adds: " the metamorphic... | |
 | Joel Dorman Steele - 1874 - 314 páginas
...into alum. The boulders and angular fragments brought down the ravine by floods are being converted into a firm conglomerate, so that it is difficult to dislodge even a small pebble, the pebble itself sometimes breaking before the cement will yield.— Shepherd, Am, Jaurn. of Science.... | |
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Pseudotrappean and magnesian rocks are consumed much like wood in a slow fire, and go to form sulphate of magnesia and other products. Granite is rendered so soft that you may crush it between your fingers, and cut it as easily as bread unbaked. The feldspar... 
