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Show '7 Chap. X X I 1. 0f the Swimming of Iii/la, , z 5- Chap. X X l l. 12.4. Whereas Filh moving in a more folid Medium of water, more commenfum F391 having vantage to bodies of [nfeé‘ts to recoil forward, which is very much promoted irreafgitby by their Expanded wings, carried downward and fomewhat backward by rate in weight to the bodies eFFilh, are more eafily carried (as being fupported iiiiivvi iii-m iii-‘iiiciiiiifiiii Minute Mufcles, which may be filled‘AddUélOI‘S; whence the Air being ii‘iifiiiiii Vibratcd toward the hinder part of 111165.", dOth by "3 {pringy dlfPOfitiona by a Medium of greater confif'tence) by the firoaks of the Tails of Filh, to iiigd'icuiiiltli‘lcn pulh their Bodies forward, after the manner of Levers ; whence it may be M" confequently inferred, that Swimming Animals might be the better treated 3353,? M' force their Bodies forward with great Agrlitya and afterward the Wings being liited up by the Abdufiors (to relax the Antagonift Mulcle) to give them the advantage of a repeated Motion, and to make a new liroak upon under the Surface of Water, and fport themfelves backward and forward, and 'Up and down within its fluid Territories, it is reqiiilite that Animals the Air, confining'tow'ai'd the Polierior parts of Infeéts, to dilpofe their converting in this Chryltalline Element, {hould very much cortefpond with bodies to afarthcr Motion, which is produced by the ltroaks of the Wings 25:39,: 2133‘? moved do" nward, and fomewhat backward, which being acted upon the it in parity of weight, that the Gravity of the one might foniewhat ba- Thcwcightdf lance the other in a kind of at uipondium, elfe if the Filh be much more iiiiiciimrcihiq bi'zlgririiilss Air running immediately under them, do only boy up their Bodies in a To. riiliaiiii nick motion of the wings :, which is often leen in Infeé‘ts, and Birds, as'Gofs. weighty Body: And if they were too ponderous, they would not be capa- {33:53:2be $31,253,". Hawks, Falcons, and others, keeping themfelves in a fixed poliurein the blerof Motion without very much firugling, which Would lell'en the plea- "if. 0 "WWW" Air upon the wing, when they endeavour to View their Game upon the Ground. And to {peak .1 Period to this DifcoiliieJnfefls move by repeated down,and back repeated jirks of their wings, fomewhat refembling the back liroaks of Oars upon the troubled water, which putteth the Boat forward With great force, caultd by the Elaltick power of that Fluid Body, prelling fer. ward upon the violent jirks of the Oars. C H A P. Light than Water, they would ardly contain themfelves, within its over- mm" "M" lure of their palTage Horn place to place, to fupport theml‘elves with Alia merits in order to their prefervation. Wherefore it is wifely difpofed by Nature, in Carps, Pikes, Touch, and featedin "Sam"?! the the like, and in inoli Filh, that Veficles big with Air, {hould be lodged in Effigy" the lower Apartiments, to the end their overmuch weight, ihould be boied l'figflf" up by light Bodies, feated above their Entrals, near the Spine, in which . .. Nature ibmewhat refembleth young Swimmers; who being unexperien, ed in the art of Swimming, tie Bladders under their Arms, to fupport their linking Bodies, otherwife depreiTed by too much weight. So that Filh being acted with quantities of Air contained in Veficles, lodged in their inward ReceflEs, do eafily float and fwim up and down in Limpid Liquor, which is principally 28th by Antagonifi Mufcles of Flex»ors and Tenfors, feared in mol't Filh in their hinder Region, which being XXII. drawn into an Arch by Flexors. is quickly dil'charged by Tenfors, making jirks by oppofite Motions, againfl: the troubled water, thereby forcin the Fglfl'lfldolfwim, Body and Head forward; which is effected (as I conceive) by diffgerent iridgidh itch" llroaks of their Tails, refiing upon the repelled water, by whole refifience, Eghl'ngbayIPILL 0f the Swimming of Pi l7. the bodies of Fifli are driven forward. Nother kind of Progrellive, is this of Swimming, which hath foine Aflinity with Flying, this being proper to Birds, and that agreeable to Filli, thofe Swimming in Water, and the other in Air, and both Medi- Birdsmc ums agree as Fluid Bodies, and differ by realon the lali is a more thin Convi'ithgreati-r {Hit-nee; whereupon Birds move in Air with far greater quicknefs, than Filh fi'flfkflgflh, in Water, which is a more grofs Medium. ‘ ‘ "‘WW' The Inliruments of Motion in Filh and Birds, are diliErent, thefe being aéied with Expanded wings, and rhofe with difplaied Fins (as fome conceive) which have l'ome Analogy with each other : But in truth, Filh that are dt-flitute of Fins, {port themlelves in their warty Element, and others holding their Fins liill, and clofe to their Bodies, by {risking their Tails in Various poliures, do quit one place, to gain another. iiiiaiiiii‘i-UM So that Fill) and Fowl, in reference to Swimming and Flight, have not gfigtllmfilli‘iims only leveral Infirnments, but alfo different mediums of Motion, the one yncutsofhio- lmVing a more gi-ols, the other a more thin 5 whereupon Birds are clothed "°"' with light coverings of Feathers, holding proportion with the Levity of the Air, to countermand the weight relating to the bodies of Birds, thereby giving them the advantage of Motion; which is managed With the greater labour of their Wings making {hunger and more frequent Vibrations upon the Air, by wholi: rililiance they dart their Bodies forward. 7 i i \Vhereas ' ) $52,221,331" Some Fifh, as Eels, Lampreys, Congers, and the like, confiliing of great ‘Mi‘h‘nd" variety of Flexors and Tenfors, lodged all along the Spines of their flen- "mom der Bodies, do incurvate the numerous Vertebres into feveral Arches, made by Flexors, which being reduced by oppoiite Mufcles, do give fucceflive \ ibrations againl't the ambient Medium, whereby they gradually {boot forward, part by part their unwildy Bodies. And not only Filh, are endowed with Swimming, but alfo Fowls, as 50r‘5‘3'kd Swans, Geefe, Ducks, and the like, which are called Palmipedes, becaule d; [fliiiriigi their Feet in fame degree do refemble the Palm of our Hand; and have as iiiiiniiiiice it were divers Digits, interfperfing their Membranes, which give to the :‘gfii‘fiflg Palms of their Feet, by reafon of their breadth, the advantage of oppo- W18 "3"" ling the Water, whereby they bring theml'elves forward (as l conceive, after this manner): Firl}, their Legs are carried inward by Flexors contrafiing themfelves, and afterward are moved outward and backward by Ten- lbrs, which being abbreviated in Motion, do dil'tend the Thigh and Leg outward, and in bWimming, make firoaks by their broad Frets againfi the water, by whole refil'tance the Expanded Feet of Palmipedes draw themfelves forward, and ft) by repeated back firoaks of their broad Feet as by Oars, making frequent Appulfes upon the water, they continue the M0« non of their Bodies forward in a fluid Medium. 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