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PALAEOLOGUS
, a See also:Byzantine See also:family name which first appears in See also:history about the See also:middle of the 11th See also:century, when See also:George Palaeologus is mentioned among the prominent supporters of Nicephorus Botaniates, and afterwards as having helped to raise Alexius I
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See also:Comnenus to the See also:throne in Io81; he is also noted for his brave See also:defence of Durazzo against the See also:Normans in that See also:year
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See also:Michael Palaeologus, probably his son, was sent by See also:Manuel II
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Comnenus into See also:Italy as See also:ambassador to the See also:court of See also:Frederick I. in 1154; in the following year he took See also:part in the See also:campaign against See also: A daughter of Thomas, Zoe by name, married See also:Ivan III. of See also:Russia . A younger See also:branch of the Palaeologi held the principality of Monferrat from 1305 to 1533, when it became See also:extinct . See See also:ROMAN EMPIRE, LATER, and articles on the See also:separate rulers . PALAEONTOLOGY (Gr . 7raXat6s, See also:ancient, neut. pl. ilvra, beings, and Xoyia, discourse, See also:science), the science of extinct forms of See also:life . Like many other natural sciences, this study dawned among the Greeks . It was retarded and took false directions until the revival of learning in Italy . It became established as a distinct branch in the beginning of the 19th century, and some-what later received the appellation " palaeontology," which was given independently by De See also:Blainville and by See also:Fischer von Waldheim about 1834 . In See also:recent years the science of See also:vegetable palaeontology has been given the distinct name of See also:Palaeobotany (q.v.), so that " palaeontology " among biologists mainly refers to See also:zoology; but historically the two cannot be disconnected . Palaeontology both borrows from and sheds See also:light upon See also:geology and other branches of the See also:physical history of the See also:earth, each of which, such as palaeogeography or palaeometeorology, is the more fascinating because of the large See also:element of the unknown, the need for constructive See also:imagination, the See also:appeal to other branches of biological and physical investigation for supplementary See also:evidence, and the See also:necessity of See also:constant comparison with the See also:present aspects of nature . The task of the palaeontologist thus begins with the See also:appearance of life on the globe, and ends in See also:close relation to the studies of the archaeologist and historian as well as of the zoologist and botanist . That See also:wealth of evidence which the zoologist enjoys, including environment in all its aspects and See also:anatomy in its perfection of See also:organs and tissues, the palaeontologist finds partially or wholly destroyed, and his highest See also:art is that of See also:complete restoration of both the past forms and past environments of life (see Plates I. and II.; See also:figs . 1, 2, 3, 4, 5) . The degree of accuracy in such anatomical and physiographic restorations from relatively imperfect evidence will always represent the See also:state of the science and the degree of its approach toward being exact or complete . Progress in the science also depends upon the pursuit of palaeontology as zoology and not as geology, because it was a See also:mere See also:accident of See also:birth which connected palaeontology so closely with geology . In See also:order to illustrate the grateful services which palaeontology through restoration may render to the related earth sciences let us imagine a vast See also:continent of the past wholly unknown in its physical features, See also:elevation, See also:climate, configuration, but richly represented by fossil remains . All the fossil See also:plants and animals of every See also:kind are brought from this continent into a great museum; the See also:latitude, See also:longitude and relative elevation of each specimen are precisely recorded; a See also:corps of investigators, having the most exact and thorough training in zoology and See also:botany, and gifted with imagination, will soon begin to restore the geographic and physiographic outlines of the continent, its fresh, brackish and See also:salt-See also:water confines, its seas, See also:rivers and lakes, its forests, uplands, plains, meadows and swamps, also to a certain extent the See also:cosmic relations of this continent, the amount and duration of its See also:sunshine, as well as something of the chemical constitution of its See also:atmosphere and the See also:waters of its rivers and seas; they will trace the progressive changes which took See also:place in the outlines of the continent and its surrounding oceans, following the invasions of the See also:land by the See also:sea and the re-emergence of the land and retreatal of the seashore; they will outline the shoals and deeps of its border seas, and trace the barriers which pre-vented intermingling of the inhabitants of the various provinces of the continent and the surrounding seas . From a study of remains of the See also:mollusca, See also:brachiopoda and other marine organisms they will determine the shallow water (littoral) and deep water (abyssal) regions of the surrounding oceans, and the clear or muddy, salt, brackish or fresh See also:character of its inland and marginal seas; and even the physical conditions of the open sea at the See also:time will be ascertained . In such manner Johannes See also:Walther (See also:Die See also:Fauna der Solnhofener Flatten Kalke Bionomisch betrachtet . Festschrift zum 7oterl Geburtstage von See also:Ernst See also:Haeckel, 1904) has restored the conditions existing in the lagoons and See also:atoll reefs of the See also:Jurassic sea of Solnhofen in See also:Bavaria; he has traced the See also:process of See also:gradual See also:accumulation of the See also:coral mud now constituting the See also:fine litho-graphic stones in the inter-See also:reef region, and has recognized the periodic laying See also:bare of the mud surfaces thus formed; he has determined the winds which carried the dust particles from the not far distant land and brought the See also:insects from the adjacent Jurassic forests . Finally the presence of the flying lizards (Pterydactylus, Rhamphorhynchus) and the ancient birds (See also:Archaeopteryx) is determined from remains in a most wonderful state of preservation in these ancient deposits . Still another example of restoration, See also:relating to the See also:surface of a continent, may be cited . It has been discovered that at the beginning of the See also:Eocene the See also:lake of Rilly occupied a vast See also:area east of the present site of See also:Paris; a water-course See also:fell there in cascades, and Munier-Chalmas has reconstructed all the details of that singular locality; plants which loved moist places, such as Marchantia, Asplenium, the covered See also:banks overshadowed bylindens, laurels, magnolias and palms; there also were found the See also:vine and the See also:ivy; mosses (Fontinalisj and Chara sheltered the See also:crayfish (Astacus); insects and even See also:flowers have left their delicate impressions in the travertine which formed the See also:borders of this lake . The Oligocene lake See also:basin of Florissant, See also:Colorado, has been reconstructed similarly by See also:Samuel Hubbard Scudder and T . D . A . See also:Cockerell, including the plants of its shores, the insects which lived upon them, the fluctuations of its level, and many other characteristics of this extinct water See also:body, now in the See also:heart of the arid region of the Rocky Mountains . Such restorations are possible because of the intimate fitness of animals and plants to their environment, and because such fitness has distinguished certain forms of life from the See also:Cambrian to the present time; the See also:species have altogether changed, but the See also:laws governing the life of certain kinds of organisms have remained exactly the same for the whole See also:period of time assigned to the duration of life; in fact, we read the conditions of the past in a See also:mirror of See also:adaptation, often sadly tarnished and incomplete owing to breaks in the palaeontological See also:record, but constantly becoming more polished by discoveries which increase the understanding of life and its all-pervading relations to the non-life . Therefore adaptation is the central principle of See also:modern palaeontology in its most comprehensive sense . This conception of the science and its possibilities is the result of very gradual advances since the beginning of the 19th century in what is known as the method of palaeontology . The history of this science, like that of all physical sciences, covers two parallel lines of development which have acted and reacted upon each other—namely, progress in exploration, See also:research and See also:discovery, and progress in philosophic See also:interpretation . Progress in these two lines is by no means See also:uniform; while, for example, palaeontology enjoyed a sudden advance See also:early in the 19th century through the discoveries and researches of See also:Cuvier, guided by his See also:genius as a See also:comparative anatomist, it was checked by his failure as a natural philosopher . The great philosophical impulse was that given by See also:Darwin in 1859 through his demonstration of the theory of descent, which gave tremendous zest to the See also:search for pedigrees (phylogeny) of the existing and extinct types of See also:animal and plant life . In future the philosophic method of palaeontology must continue to advance step by step with exploration; it would be a reproach to later generations if they did not progress as far beyond the philosophic status of Cuvier, See also:Owen and even of See also:Huxley and See also:Cope, as the new materials represent an advance upon the material opportunities which came to them through exploration . To set forth how best to do our thinking, rather than to follow the triumphs achieved in any particular See also:line of exploration, and to present the point we have now reached in the method or principles of palaeontology, is the See also:chief purpose of this See also:article . The illustrations will be See also:drawn both from vertebrate and invertebrate palaeontology . In the latter branch the author is wholly indebted to See also:Professor Amadeus W . Grabau of See also:Columbia University . The subject will be treated in its biological aspects, because the relations of palaeontology to See also:historical and strati-graphic geology are more appropriately considered under the article GEOLOGY . See also, for botany, the article PALAEOBOTANY . We may first trace in outline the history of the birth of palaeontological ideas, from the time of their first adumbration . But for full details reference must be made to the See also:treatises on the history of the science cited in the bibliography at the end of the article . I.-FIRST HISTORIC PERIOD The scientific recognition of fossils as connected with the past history of the earth, from See also:Aristotle (384-322 B.C.) to the beginning of the 19th century, in connexion with the rise of comparative anatomy and geology.—The See also:dawn of the science covers the first observation of facts and the rudiments of true interpretation . Among the Greeks, Aristotle (384-322 B.C.) See also:Xenophon (430-357 B.C.) and Straho (63 B.C.-A.D . 24) knew of the existence of fossils and surmised in a crude way their relation to earth history . Similar prophetic views are found among certain Roman writers . The pioneers of the science in the 16th and r 7th centuries put forth anticipations of some of the well-known modern principles, often followed by recantations, through deference to prevailing religious or traditional beliefs . There were the retarding influences of the See also:Mosaic See also:account of sudden creation, and the belief that fossils represented See also:relics of a universal See also:deluge .
There were crude See also:medieval notions that fossils were " freaks " or " See also:sports " of nature (lusus naturae), or that they represented failures of a creative force within the earth (a notion of See also:Greek and Arabic origin), or that larger and smaller fossils represented the remains of races of giants or of pygmies (the mythical See also:idea)
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As early as the middle of the 15th century Leonardo da See also:Vinci (1452–1519) recognized in seashells as well as in the See also:teeth of marine fishes proofs of ancient sea-levels on what are now the summits of the See also:Apennines
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Successive observers in Italy, notably See also:Fracastoro (1483–1553), Fabio See also:Colonna (1567–1640 or 165o) and Nicolaus See also:Steno (1638–c
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1687), a Danish anatomist, professor in See also:Padua, advanced the still embryonic science and set forth the principle of comparison of fossil with living forms
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Near the end of the 17th century See also:
The beginnings of palaeogeography followed those of palaeometeorology
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The See also:Italian geologist Soldani distinguished (1758) between the fossil fauna of the deep sea and of the See also:shore-lines
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In the same year Johann See also:Gesner (1709–1790) set forth the theory of a great period of time, which he estimated at 8o,000 years, for the elevation of the shell-bearing levels of the Apennines to their present height above the sea
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The brilliant See also:French naturalist Georges See also:
See also:Political troubles and the dominating See also:influence of Werner's speculations checked palaeontology in Germany, while under the leadership of Lamarck and Cuvier See also:France came to the fore
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J
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B
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Lamarck (1744–1829) was the founder of invertebrate palaeontology
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The See also:treatise which laid the See also:foundation for all subsequent invertebrate palaeontology was his memoir, Sur les fossiles See also:des environs de Paris
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(1802–1806)
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Beginning in 1793 he boldly advocated See also:evolution, and further elaborated five great principles--namely, the method of comparison of extinct and existing forms, the broad sequence of formations and succession of epochs, the correlation of geological horizons by means of fossils, the See also:climatic or environmental changes as influencing the development of species, the See also:inheritance of the bodily modifications caused by See also:change of See also:habit and See also:habitat
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As a natural philosopher he radically opposed Cuvier and was distinctly a precursor of uniformitarianism, advocating the See also:hypothesis of slow changes and See also:variations, both in living forms and in their environment
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His speculations on phylogeny, or the descent of invertebrates and vertebrates, were, however, most fantastic and See also:bore no relation to palaeontological evidence
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It is most interesting to See also:note that William See also:
Cuvier (1769–1832) is famous as the founder of vertebrate palaeontology, and with See also:Alexandre See also:Brongniart (177o–1847) as the author of the first exact contribution to stratigraphic geology
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Early trained as a comparative anatomist, the discovery of Upper Eocene mammals in the See also:gypsum quarries of Montmartre found him fully prepared (1798), and in 1812 appeared his Recherches sur les ossemens fossiles, brilliantly written and constituting the foundation of the modern study of the extinct vertebrates
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Invulnerable in exact anatomical description and comparison, he failed in all his philosophical generalizations, even in those strictly within the domain of anatomy
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His famous " See also:law of correlation;" which by its apparent brilliancy added enormously to his See also:prestige, is not supported by modern philosophical anatomy, and his services to stratigraphy were diminished by his generalizations as to a succession of sudden extinctions and renovations of life
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His See also:joint See also:memoirs with Brongniart, Essai sur la geographie mineralogique des environs de Paris aver une See also:carte geognostique et des coupes de terrain (18o8) and Description geologique des environs de Paris (1835) were based on the wonderful succession of Tertiary faunas in the rocks of the Paris basin
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In Cuvier's defence See also: It was Alcide Dessalines d'See also:Orbigny (1802—1857) who pushed to an extreme Cuvier's ideas of the fixity of species and of successive extinctions, and finally developed the See also:wild hypothesis of twenty-seven distinct Creations . While these views were current in France, exaggerating and surpassing the thought of Cuvier, they were strongly opposed in Germany by such authors as Ernst Friedrich von See also:Schlotheim (1764—1832) and Heinrich Georg See also:Bronn (18o0—1862); and the latter demonstrated that certain species actually pass from one formation to another . In the meantime the See also:foundations of palaeobotany were being laid (1804) by Ernst Friedrich von Schlotheim (1764—1832), (1811) by Kaspar Maria See also:Sternberg (1761—1838) and (1838) by See also:Theophile Brongniart (180x—1876) . Following Cuvier's Recherches sur les ossemens fossiles, the See also:rich succession of Tertiary mammalian life was gradually revealed to France through the explorations and descriptions of such authors as Croizet, Jobert, de Christol, Eymar, Pomel and Lartet, during a period of rather dry, systematic See also:work, which included, however, the broader generalizations of See also:Henri See also:Marie Ducrotay de Blainville (1778—1850), and culminated in the comprehensive treatises on Tertiary palaeontology of See also:Paul See also:Gervais (1816—1879) . Extending the knowledge of the extinct mammals of Germany, the See also:principal contributors were Georg See also:August See also:Goldfuss (1782—1848), Georg Friedrich von Jaegar (1785—1866), See also:Felix F . Plieninger (1807—1873) and Johann See also:Jacob See also:Kaup (1803—1873) . As Cuvier founded the palaeontology of mammals and See also:reptiles, so Louis See also:Agassiz's See also:epoch-making See also:works Recherches sur les poissons fossiles (1833—1845) laid the secure foundations of palaeichthyology, and were followed by See also:Christian Heinrich Pander's (1794—1865) classic memoirs on the fossil fishes of Russia . In See also:philosophy Agassiz was distinctly a See also:disciple of Cuvier and supporter of the doctrine of special creation, and to a more limited extent of cataclysmic extinctions . Animals of the next higher order, the amphibians of the See also:coal See also:measures and the See also:Permian, were first comprehensively treated in the masterly memoirs of Christian Erich See also:Hermann von See also:Meyer (18or—1869) beginning in 1829, especially in his Beitrtige zur Petrefactenkunde (1829—1830) and his Zur Fauna der Vorwelt (4 vols., 1845—186o) . Successive discoveries gradually revealed the See also:world of extinct Reptilia; in 182 r Charles See also:Konig (1784—1851), the first keeper of the mineralogical collection in the See also:British Museum, described See also:Ichthyosaurus from the Jurassic; in the same year William See also: |