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Show -"‘_ 0f the 2)‘r*67i€5 0f the Heart. .Bool; ll: the moll: felcét part being Colliquated by heat, doth feparate from the more grofs, and not move promifcuoufly at large, but is confined Within proper Channels which fii'li take their progrefs toward the rough draught of the Heart, by whole motion it is impelled through the Retrograde Tubes, which are the firli origens of the Arteries, as being produced out oi the more clammy Particles of the Genital Matter concreted into Concave men . branous Vefiels, importing Vital Juice into the ambient parts of the Semi. nalColliquated Liquor, to give it life and heat in order to the rough draught of the parts belonging to feveral Animals. Arteries, as to their Figure, are Cylinders, having oblong, round, concave bodies fitted for the reception and tranfmiflion of Vital Liquor from the Center to the Circumference, from the Heart to the ambient parts of the Body. The fubllance Their fubliance is framed of numerous fmall nervous and membranous Fi:23" Am" laments (interfperfed with Helhy Fibres) clofely conjoyned to each other, produced originally our of the more tenfil and clammy parts of the Seminal liquor; Thefe Fibres interfeét each other in various pol'tures, fome being right, others oblique, and a third tranfverfe. This Hypothelis of Fibres integrating this membranous Tube, may be proved, as I humbly conceive, by rcalon if the Vellels were made of one continued coucretcd fubftance, without the texture of various Filaments, their Coats would not be difiendcd with a quantity of Blood, without Laceration 3 370 that the numerous minute Filaments being tough and flexible, being of a firm pliable nature, can give way and grow fwelled by a large proportion of Liquor immitted into this membranous fyltem of Fibres, without any violation of their round minute Bodies. The Compage of the florta, and its Branches, is compofed of four Coats. """"‘""" The lirl't and outward Tunicle is propagated m M C0,, from the ‘Pleura, in the middle Apm‘timent, and from the rim of the Belly in the loweli, and is dellitute of it when it enters into the sztem; This Coat ‘7" ‘ .A, is of a Netvous conliitution, asintegrared of many Nervous Fibres, finely fpun, and curioully interwoven with each other, after the manner of Network, wrought in the inlide. l" 1, Thefrm'd hiiiiimc - its inward lurface and is adorned in its upper fide, with a retiform plex of divaricated Fibrils 5 this Tunicle, as I conceive, is propagated from r w ..;.;.«4.1' A The fecond Coat of the Arteries is affixed to this retiform Tunicle, and is a Membrane belct with numerous minute Glands, overfpreadmg the Coat (inveliing the Heart) to which it is continued. The third Tunicle of the Arteries is more firm and thick, then the out. , . ward, efpecrally in the, common Trunk of the Aorta, conioyned to the left MW "m" Ventricle of the Heart, that it might contain the hot fpirituous thin blood immediately received from the left Ventricle without the diflipation of its V0latil Spirituous parts, and as the Arteries are more difiant from the Center of the Body they grow more thin and foft. This Coat is furnilhed with many tranfverfe, or rather circular flefliy Fibres which are very confpicuous in the common Trunk of the Aorta, relating to a great Beal't. Learned Rolfizzt/Jim, conceived the fubl'tance of the? Arteries to be wholly Membranous, as not having any flelhy Fibres; Lib 6Anatrwm, (up. 4. Air We, now flatuimtu fulzfl amiam Arteriarum tfli- swam, Allbillbrflllfdlils W]; apfe Mfr? reférri ad aliqudil: diéia rum partium, fed {fl _The third "m, M, is en med lWOPrAH)! c} [111' generis, zmilitudine Mmen Colflrilrz'yv Craflitiei {emu/art. Cartilizorrz'zrtr. fibre in [Mt Arteriamm fit/Iflamia 21072 damn r proprié [Iii-57w; but with Book ll. 0f [/90 flrterier of the Heart. n, 78 I with deference to this worthy Author, I humbly conceive this Conjecture uppofeth Auropfie, for we may eafily difcern the flefhy Fibres in the common Trunk of the Aorta, when boiled. Fatthermore I apprehend that the flelhy Fibres of the Arteries may be clearly evinced by Reafon, becaufe if the Arteries were not befet with Carnous Fibres, when they are dilated by a great quantity of Blood in {trong Pulfations, they would remain in the fame dil'tended pollure, had they not a power to reftore tliemlEIV'ts to their former tone by the power of Fibs-es. And I farther believe, that the caufe of an Aneurifm, that when the fecond Coat of the Arteries, and its Fibres being broken, the Blood hath a recourfe to the outward Tunicle , which being foft, is cafily difiended, whence arileth oftentimes a large beating tumor. The fourth Tunicle of the Arteries, as Great Calm hath ohferved, is as Eidjtfzufnllll'e it were a thin membranous Tunicle, refembling 2 Spiders Web, which is Aunt. A vilible to a curious Eye making infpeciion into the inward recelles of the great Artery, and feemeth to be the off-fpring of the inward Tunicle inveliing theinlide of the left Ventricle, as being a continuation of that thin Coat. This Tunicle is Membranous. as compofed of many Fibres of the fame kind, fome of which being carried in length, do interfec‘t the annular Helhy Fibres, according to right Angles. As to the fubflance of the Arteries, fome hold it to be wholly Nervous, $33,061?ic as being cotnpofed of many Fibres, which cannot be the fole off-lprin g of Aircrlicsgobr Nerves, by reafon the Arteries are endued with little or no fenfe: Others lisiiosiy ‘m‘ conceive the Compage of the Arteries to be Cartilagineous, by reafon many great Anatomilis have found the Arteries near the Heart to be grifly and fometimes bony, but this is preternatural, and cannot be termed the true and proper fubl'tance of the Arteries, which is chiefly made up of many Membranous Fibres, endued with an obtufe fenfe, and thefe Fibres are peculiar to the Coats of the Arteries and Veins, and to no other Membranes relating to the Body. _ The Arteries feem to have a double motion, Diallole and Syliole ; The have Th"‘"‘"°‘ a double firfl', I humbly conceive, is produced by the fyfiole of the Heart highly con- iifitcioiiifdiatracting the Ventricles, impelling the Blood out of the right VentricleinHula to the Pulmonary Artery, and out of the left into the common Trunk of the Aorta, and fo into all Arteries 5 but the manner how the pulfation of the Arteries is made in all parts of the body in the fameinl'tant is hard to be underliood; Learned Dr. Harvey exprelfeth it after this manner, That the pulfarion of Arteries is performed by the impulfe of the Blood, at the Tr", mgnnfr fame time affeé‘ting all the Arteries, as when an immiflion of Breath is made Zoi‘tirliii'ca' into the great cavity of a Glove, at the fame moment all the Fingers are 3,3335" dll'tendcd 3 In l i0. dc Mam Corali/r, Cap. 3g. Ait i112, Deniq; Arteriarum Drr'l'm'fl {Pulfimzficri (lb iWPM/flt janguinir e‘ Ventriculo fimfl'ro, e0 p430, qua mm quit in Clsirot/Jemm influx, 01mm dzgitorfimul wide! dijiemili, (by KPal/um avmtlari: To WhICh Imake bold, With the Great Author's leave, to fpeak this Reply, That the Simile of immitfion of Breath from the Hand to the Fingers, doth not hold by reafon the difiance is very fmall between them, R) that the Breath may be Immediate! y conveyed from one part to the other, which cannot be {0 eafily Cfiefied in the motion of the Blood from the left Chamber of the Heart into the Extremities of the Arteries, which are feated at a great dif'tance from each other. Learned |