Geological Biology: An Introduction to the Geological History of OrganismsH. Holt and Company, 1895 - 395 стор. |
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Сторінка xi
... represented - Preservation of fos- sils , 79. - The majority of fossils are of marine organisms - Various kinds of fossils enumerated , 8o . - Fossils represent chiefly the hard parts of organisms - Best and most perfectly adjusted ...
... represented - Preservation of fos- sils , 79. - The majority of fossils are of marine organisms - Various kinds of fossils enumerated , 8o . - Fossils represent chiefly the hard parts of organisms - Best and most perfectly adjusted ...
Сторінка xiv
... represented , 187. - Spirifer striatus Martin , var . S. Logani Hall , taken as the example , 188. - New species con- ceived of as arising by a process of variable characters becoming permanent , 189. — Characters of any particular ...
... represented , 187. - Spirifer striatus Martin , var . S. Logani Hall , taken as the example , 188. - New species con- ceived of as arising by a process of variable characters becoming permanent , 189. — Characters of any particular ...
Сторінка xviii
... represented at the initial period of the genus - Three epochs of expansion , with slow and gradual change during the rest of the history of the genus , 314. — Characteristics of the life - history of Atrypa reticularis , 315 ...
... represented at the initial period of the genus - Three epochs of expansion , with slow and gradual change during the rest of the history of the genus , 314. — Characteristics of the life - history of Atrypa reticularis , 315 ...
Сторінка 2
... represented in less com- plex form in other animals ; if he may find his functions in operation in simpler forms of life , and separated into their elements in lower types , then he has in the organic world a field of study of the ...
... represented in less com- plex form in other animals ; if he may find his functions in operation in simpler forms of life , and separated into their elements in lower types , then he has in the organic world a field of study of the ...
Сторінка 31
... represented by these systems ; hence the periods of time - duration receive the names of the systems which were formed during the periods . The expression , the Cambrian Period , means the period of time during which the Cambrian system ...
... represented by these systems ; hence the periods of time - duration receive the names of the systems which were formed during the periods . The expression , the Cambrian Period , means the period of time during which the Cambrian system ...
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Загальні терміни та фрази
adaptation adjustment Ammonites ancestry animals appearance brachidium Brachiopods calcareous called Cambrian Carboniferous cell Cenozoic characteristic classification conditions of environment continuous corals Cretaceous curve Cuvier Darwin definite deposits Devonian differentiation distinct distinguished distribution divisions elaboration Eocene epoch estimate evidence evolution expressed facts families faunas floras formations fossils function fundamental Gastropoda genera genus geographical Goniatites growth Helicopegmata history of organisms individual organism Jurassic lamellæ life-period limestone living lobes marine ment Mesozoic Metazoa Miocene modification Mollusca morphological characters mutability mutability of species natural selection nomenclature observed Ordovician origin of species Paleontology Paleozoic particular period present preserved rank recognized region relation represented result sediments separate shell Silurian specific characters specimen spiral Spirifer stage strata structure suborder succession surface suture term Tertiary theory thickness time-ratios time-scale tion Triassic valve variation ventral Zittel Zoantharia zone
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Сторінка 196 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Сторінка 196 - These laws, taken in the largest sense, being Growth with Reproduction ; Inheritance which is almost implied by reproduction; Variability from the indirect and direct action of the conditions of life, and from use and disuse...
Сторінка 195 - Analogy would lead me one step further, namely, to the belief that all animals and plants are descended from some one prototype. But analogy may be a deceitful guide.
Сторінка 14 - He was a Fellow of the Royal Societies of London and Edinburgh, member of the Royal Irish Academy, and of...
Сторінка v - Two conclusions are now generally accepted : The first is, that the most complete evidence of evolution is afforded by paleontology. Huxley's vigorous affirmation, that the primary and direct evidence in favor of evolution can be furnished only by paleontology, has been greatly strengthened by recent discoveries. The second is, that biological evolution has been primarily dependent on physical and geological changes. It may not be unprofitable for us as zoologists to pass in review some of the revolutions...
Сторінка 324 - The evolution of a family like the Titanotheres presents an uninterrupted march in one direction. While apparently prosperous and attaining a great size, it was really passing into a great corral of inadaptation to the grasses which were introduced in the middle Miocene. So with other families and lesser lines, extinction came in at the end of a term of development and high specialization. With other families no causes for extinction can be assigned, as in the lopping off of the smaller Miocene perissodactyls.
Сторінка 154 - Life is purely a physical phenomenon. All the phenomena of life depend on mechanical, physical, and chemical causes, which are inherent in the nature of matter itself. The simplest animals and the simplest plants, which stand at the lowest point in the scale of organization, have originated and still originate by spontaneous generation.
Сторінка 19 - NECESSITY dictates the adoption of some system, so far as respects the classification and arrangement of names. The Wernerian seems to be the most suitable, first, because it is the most perfect and extensive in its general outlines — and secondly, the nature and relative situation of the minerals in the United States, whilst they are certainly the most extensive of any field yet examined, may perhaps be found the most correct elucidation of the general accuracy of that theory, so far as respects...