Principles of Geology: Being an Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation, Bind 2J. Murray, 1832 - 511 sider |
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Side 2
... century to century , may proceed as if the apparent places of the fixed stars remained absolutely the same , and as if no alteration was brought about by the preces- sion of the equinoxes , so it is said in the organic world , the ...
... century to century , may proceed as if the apparent places of the fixed stars remained absolutely the same , and as if no alteration was brought about by the preces- sion of the equinoxes , so it is said in the organic world , the ...
Side 21
... last half century . That the embarrass- ment of those who attempt to classify and distinguish the new acquisitions poured in such multitudes into our museums , should Ch . II . ] 21 PERMANENCE OF THE SPECIFIC CHARACTER .
... last half century . That the embarrass- ment of those who attempt to classify and distinguish the new acquisitions poured in such multitudes into our museums , should Ch . II . ] 21 PERMANENCE OF THE SPECIFIC CHARACTER .
Side 24
... centuries for more than 20 ° Fahrenheit ; so that if a plant or animal be provided with an organization fitting it to endure such a range , it may continue on the globe for that immense period , although every individual might be liable ...
... centuries for more than 20 ° Fahrenheit ; so that if a plant or animal be provided with an organization fitting it to endure such a range , it may continue on the globe for that immense period , although every individual might be liable ...
Side 28
... century , they hunted in packs from twelve to fifty , or more in number , and fearlessly attacked herds of wild - boars and other animals . It is natural , therefore , to enquire to what form they reverted ? Now they are said by many ...
... century , they hunted in packs from twelve to fifty , or more in number , and fearlessly attacked herds of wild - boars and other animals . It is natural , therefore , to enquire to what form they reverted ? Now they are said by many ...
Side 30
... centuries , has been naturalized in every part of the new world , from the cold regions of Canada to the tropical plains of Guiana ; yet it has scarcely undergone any perceptible mutation , and is still the same animal which was held ...
... centuries , has been naturalized in every part of the new world , from the cold regions of Canada to the tropical plains of Guiana ; yet it has scarcely undergone any perceptible mutation , and is still the same animal which was held ...
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Almindelige termer og sætninger
alluvium alteration ancient animal and vegetable animals and plants appear aquatic aqueous become birds bones bottom breccia buried calcareous carbonic acid causes century cetacea circumstances climate coast considerable continually coral coral reefs covered deposits depth drifted earth earthquakes elevation estuaries Europe example existence feet fissures floods forests formations fresh-water geological geologist globe gradually habits human hundred hyæna hybrid Iceland imbedded individuals infer inhabitants insects islands isles lagoon lakes Lamarck land latitudes lava limestone living marine mass matter migrations miles molluscs Morayshire moss mountains naturalists nature observed ocean organic original Pacific peat peculiar period physical geography plants and animals preserved produced quadrupeds quantity races reefs regions remains river rocks sand Scotland seeds shells shores soil sometimes species spot stalagmite strata subaqueous subterranean suppose terrestrial terrestrial animals terrestrial plants tertiary testacea thousand tion tract trees tropical volcanic wild zoophytes
Populære passager
Side 125 - In bigness to surpass earth's giant sons, Now less than smallest dwarfs in narrow room Throng numberless...
Side 218 - Earth, sand, gravel, stones, and other transported matter which has been washed away and thrown down by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas.
Side 124 - ... life, in the creation of which nature has been so prodigal. A scanty number of minute individuals, only to be detected by careful research, and often not...
Side 202 - Thus, in Mar forest, in Aberdeenshire, large trunks of Scotch fir, which had fallen from age and decay, were soon immured in peat, formed partly out of their perishing leaves and branches, and in part from the growth of other plants. We also learn, that the overthrow of a forest by a storm, about the middle of the seventeenth century, gave rise to a peat moss near Lochbroom, in Ross-shire, where^ in less than half a century after the fall of the trees, the inhabitants dug peat.* Dr.
Side 46 - If, therefore, the relative fecundity or hardiness of hybrids be in the least degree inferior, they cannot maintain their footing for many generations, even if they were ever produced beyond one generation in a wild state. In the universal struggle for existence, the right of the strongest eventually prevails; and the strength and durability of a race depends mainly on its prolificness, in which hybrids are acknowledged to be deficient.
Side 111 - Were the whole of mankind now cut off, with the exception of one family, inhabiting the old or new continent, or Australia, or even some coral islet of the Pacific, we...
Side 256 - Gharee; its breadth from north to south is conjectured to be in some parts sixteen miles, and its greatest ascertained height above the original level of the delta is ten feet, an elevation which appears to the eye to be very uniform throughout.
Side 14 - We must suppose that when the author of nature creates an animal or a plant, all the possible circumstances in which its descendants are destined to live are foreseen, and that an organization is conferred upon it which will enable the species to perpetuate itself, and survive under all the varying circumstances to which it must be inevitably exposed.
Side 53 - If you examine the brain of the mammalia, says M. Serres, at an early stage of uterine life, you perceive the cerebral hemispheres consolidated, as in fish, in two vesicles, isolated one from the other ; at a later period, you see them affect the configuration of the cerebral hemispheres of reptiles ; still later again, they present you with the forms of those of birds ; finally, they acquire, at the era of birth, and sometimes later, the permanent forms which the adult mammalia present.
Side 208 - They are not horns which have been shed ; for portions of the skull are found attached, proving that the whole animal perished. Bones of the ox, hog, horse, sheep, and other herbivorous animals, also occur ; and in Ireland, and the Isle of Man, skeletons of a gigantic elk ; but no remains have been met with belonging to those extinct quadrupeds of which the living congeners inhabit warmer latitudes , such as the elephant, rhinoceros, hippopotamus, hyena, and tiger, though these are so common in superficial...