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Show Book. ll, C H A P. Book II. V. 0/ we aria-{[7 if 5/79; 0f the Widrifl of ‘Birdri Lthough Birds having their Lungs affixed to their Backs and Ribs are He Midrif‘F of Cetaceous Fiih differeth very much from that of other, asit is an b'madlm‘ not endued with a Diaphragm, like a wall in other Creatures liver_ _ . h ) "PPM" "m ing the Heart and Lungs from the szcem of the Venter , yet they have a N r in. defcftofa Fibres, enlarging the Circumference of the T/Jarizxin dinienfions, by bringing TheMem- . to the Lungs, in i Erik." " 7 ‘ feparatest h em from the b d . . to the" Lungs which . Guts , ‘ and other V325: dihniipin that account may be ltyled a kind of Midrifl , . as endned with Membranes and flefhy Fibres (coming as I conceive from the Intercollal Mufcles) which may be plainly difcovered in great Birds, as Eltriges, Swans, and the like. . 1 1] m; Mm. This, Membrane parting the Lungs from the other szccrfz, may C m enge brancis htfct to it felf the Appellative of a Diaphragm, as being befet With many Car-nous 'thC 2 . . , , . Eilm'azl'fiuiss which being Perforated, do 4, i Fibres, aflifiing the refpiration of _the Lungs, . ' . fiiinifiiigi'l tranfmit Air into the empty fpace, interceding the Lungs and the neighbour- ing Membrane, whereupon it groweth dif'tended by the impulfe of the Breath expanding it in Infpiration. ThisMcm. . And in Expiration, the tender Compage of the adyacent Membrane 3331:5333; is Dilated by infpired Air, with which it being Irritated, doth endeavour to "lifters"? bring it felf toa Plain by the motion of its Flefliy Fibres, whereupon it lefiiiiiiiiiiilh- feneth the Cavity, pafling between the Lungs and the adiaeent Mmbrane, and Compreffeth the infpired Air, and Repelleth it through the Perforations into the fubfiance of the Lungs. , ~ , . . "Cm-"me This Membrane difl‘ereth from the Midriff of other Animals, in its ii{if thipriem- tuation, and connexion, and paileth longways down the Aihrlomeiz, and not xiindidrdfor tranfverfely, as from the Back to the termination of the Ribs, as in greater :3}: 32nd; Animals. . _ . :iii‘iigii-Tiid SCCOHdly, This Membrane hath a different Figure from the Diaphragm of Situation- other Animals, as it is affected, when relaxed With a Concave Figure to the Lungs, and Convex to the Inteflines; whereas the Diaphragm of other Animals, in its pofiure of reliiturion hath its Concave Surface, facing the szccra of the lowel‘t Venter, and its Covex toward thofe of the middle. . Farthetmore this Membrane doth not enlarge the Perimeter of the Breafi: TheCavrty of _ . , . ‘ . . . . theBrcallis in length, as the Midriff of other Animals doth in Infpiration, to give recep"mootrTfs:gcin tion to the Lungs, Dilated with Air; but when this Membrane is moved mpfiggf by with flefhy Fibres, doth norrow the Cavity of the Alia/amen, and help Ex- branc. Piration by beatin g the Air backward ( brought in by Infpitation) throug h holes into the body of the Lungs. ‘\ Engine of Motion, confifting of Carnous and Tt-ndi nons its Concave Surface to :1 Plain, to entertain the Lungs Dilated with the Elai'tick Particles of Air, puffing up their fubliance. The Midrilf of ordinary Filh is not capable of motion, as being a CartiTIi laginous fubi'tance or Mcmbranous Contexture, not interlinerltd with Fleiliy U and Tendinous Fibres , the fine Machines of Motion, w erebv the Dia- "'1‘" phragm of mof't Filh ferveth only as an Interfepimen t to part the Gills and Heart from the Vifrera repofed in the loweitapartiment of the Body. But the Midriff of a Porpels is made up of an upper and lower Membrane, mcompsgg interlined every way with a thick Mufcular Expanfion, and . differeth from 0W" "9113 . . i the Diaphragm of 0‘ "mine mladrupeds, becaufe it is deflitlite of an Apolzez irafir in the middle, where it is alfo Flefliy, as well as in the circumference, which I clearly {aw in a Porpefs opened, wherein Ifepar ated the two Membranes .. from the inward Flelhy fubftance 5 pafling every where between the two Coats. . The Diaphragm of this Animal is faf‘tned one Way to the Vertebrcs of the Theconncxii Back, and on the other to the Terminations of the Ribs and Sternon, and Tfirfifflfifi"; on each {ide to the Arches of the lower Ribs, by the interpofition of i'ml'ifs' various Fibres. , _ The Mufcular Expanfion feared in the middle Of two Membranous Tnte- The Fibres of guments, is made up for the mofi: part of right Fibres, ( running from the t:i;;gi:‘-gfg Center to the Circumference) and fome few feem to be oblique, and others i"°'Y""‘ circular aboutthe Perforation made by the Gulet 2 The Midriff ofa Porpefs is not only belie: with many Flefhy Fibres but Tendinons too 3 fome being very large do pais down the "pine, and others creep . over the 'Pfim, and many other fmaller Tendi nous Fibres are interminaled with the Flefhy, which may be difcerned on each tide of the Diaphragm? The Flefhy and Tendinous Compage of this Orbicular Mufcle is invefied above and below with a fine Covering. The outward or rather upper Tunicle, is very thin, and rtiade up of many The up)" minute Membranous Filaments rarely framed in variety of Pofitions. The lower Integument is a thicker Coat, made up of many Nervous Emilio'l‘hc‘ Fi- 111373;", brils, finely fpun, clofely firuck, and curioufly interwoven. ghfihiigrif The ufe of the Midriff in this Animal, is the Fame with that of Brian and Thrur': W6 miadrupeds, to be a machine of Motion, where an Arch toward 2! Plain, to render the Cavity of by it bringeth it felf from yriiiiiiijnms the Thorax niorelong to give way to the expanded Lungs in Infpiration. The Midriff of molt if notzill Filh, except thofe have a Cartilaginous ( which is rare) or Membranousof a Cetaceous hind fnbftance not inter: lined with a I‘Viufcular Expanfion, not befet with Flcfhy and Tendinons Fibres, as they are not Machines of ordina ry Riotion, but ferve only as a party-wall, {Gifting the middle from the lorveft apartiment. 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