| OCR Text |
Show Clarity ll, 0/ CProgrcfriw Jul/fancy. i o'er 3 And While the Tarliis of the hinder Foot is lifted up gradually, the cen. trr of Gravitation is transferred from the 'l‘arl‘e to the Metatarli', and TOW. 7 ,- and the I‘oreleg and Thigh being carried up by {cveral li'lexions into the " ' Air, the Body being born lorward, Would necell: my iall, unlels the Fore- ‘ Limb was immediately extended, and the Foot clapped to the Ground to »entertain the Center of Gravitation, and lupport the weight of the L. . meteri- Body. t 1 n1 (nati- 'I lit-relore it is ei‘ident, while the Fore-foot is ready toland on the Ground the Hinder-foot by it wheeling upon the Metatarlb and Toes, doth drain; the Trunk of the Body foreward ', that the other Limb being extended, the From whence it followeth of Courl‘e, that oppofite Motions, being made :msrcmvc lotion being um" dili'ei‘CI'IE Centers, are mixed, as compounded of divers {cements of mitt-",0nai‘ Circles, defcribed ol‘ the extreams of bended parts 3 _\Vhereupon‘ Progreflivc ‘ Motion of Animals, cannot be truly Ptiled purely right, whether the Mo~ PUICI'igleU" but ra~ tion of the Trunk oi the Body, or Thigh, be made upon the Cokendix, or ‘thion,rmithd, the Leg upon the Thigh Bone, or the Foot upon the termination of the 0; film) or the Toes upon the Metatarfe, .and all the Flexrons 0i thefe feve- ral parts of our] imbs, are portions ‘or kinds of a Circular Motion, which cannOE be apprehended Without diflerent I/ollsures, in which one part of a Limb alternately receiveth the Motion of another, delcriblng not only Center of Gravitation may be turned Upon the Heel of the Fore-foot: firaight but crooked Lines, produced by the oppofite Politires, of the fevo» Which is the realbn why we are more obnoxious to fall in Running, then tal portions of the Limbs. Going. Becaule when out Body is hurried in a violent motion, the Hinder- loot is railed from the Tarfiis, to the Metatarliis, and Toes, with {0 much quickncls and vehemence, that the Fore-foot upon the leall: Impediment t on of the Limbs, when cannot to readily land upon the Ground, and receive the \veioht of thd Body, and give a flop to its fall. D And this renitence of the Hindenfoot, is made by its telling upon the ' GroundJ and .bearing . the Trunk forward, and pi‘elling the Area back« \vard : And this is the caufe Why different Animals, in their Various Progrellne Motions of Going, Flying, Swimming, Creeping, are carried forward, by prelling againl} divers mediums of Earth, AierVater, by whole r rtltPtance the numerous kinds of Creatures bring their Bodies forward. In Progrellive IVIotion, both the Limbs being Auxiliaries, {peak a kind or grateful return to each other in mutual allil‘tance, by taking turns interchangeably, in variety ofl'olttti'es and Stations; lb that the Fore-foot beThe Li i bsarc (M. utnrsio tznh other I! altern ri- coineth the binder, and the hinder the fore, in alternate changes of lace now and then to receive the Center of Gravitation, to fiillain the vfei hi ol the Body, and other Limbs, by oppofite motions to draw the Trtiitk forward, and transfer the Body from place to place, in which, one Limb icing unable at once to bear up the weight of the Body, and bring; it for- tins humus, H1 rc'crcnie m Privgr F ward at the fame infrant, Nature hath molt wifely ordered the concurrence of 'anorher Limb, to promote the celebration of Local lVIotion 5 which rel' qun-etn many Feet, or two at leaf}: So that the weight of a Humane Body, l' . - according to the Center of Gravity, refiing perpendicularly upon one Limb, ixl inn), pinnot lie-carr inc N Anni. Tlvei\"'i [i iii and thclh'y ied forward, without alteration of Pollures, and mull necefat ily Fall in the Incurvation of the Body, when its Weight is carried beyond pr'rnhi nlali mull l LtL‘lldiilv nilnlilc, unlit} thit: um ol'mrivitv hc lrtCi' veil by the YUKC'lImb. a perpendicular, unlels it he immediately transfer red to another Limb7 to lupport it. And it is not only requifite in Progreflive Motio n, to have divers Limbs and lit-ct, but allo variety of their Pollnres, and Centers of their Motion' As Air/lor/c, the great Maflerof Pliilofophy, hath mol't truly allerted Th the Motion of partst IOE bL C(‘ Cl) (rlCLl 7 ransfi-rring the whole Body from Term to Term , caiiE \VII Oll C (ll‘liLlCl I C loud-"e5 0‘ tllC [11" I bq, C Onliltlnd3 0f _ Flerion and Tenlion, which cannot be exerted in Progrei'liv t outlbinequielbent terms, as to many Phylic al Points place; Iii/iouon) W"lbn, divers v. enters of it," on. Al'ttCttl.1tIOlIOl Bones, which lerve'as Cente rs (aboiit which CTN" "6 moved) the bended parts of Limbs pals from a right (which ah ehmd lin- fore With the neighbouring Terms) to a crook ed Polition bt Bl" l: hemake Angles with the {aid parts, and on the other fide tlie citW dlcd t CY 01 Limbs alter their crooked and angul ar hiodels, into l'l‘Yllt Politcibln: P31" c D ' From C H A P. XVIII. 0f the [metal Centers, Origcm, Irfl'rtiom, and flffiom of Alli/clot, relating to Trogrefrme [l/Iotum. Aving taken fome View of Progreflive Motion, in a common Apprem' henlion, I [hall row Addrefs my {elf to a more exaé't Survey of it, in detcribing the Ofteology of the lower Limbs, made up of many particular Bones, to which, as lo many Centersy the heads of many various The Limbsrare Mulbles, are affixed; and how Progreflive Motion is managed by the 5 contractions of Antagonilt Mulcles (which I intend to defcribe) making lEVeral Flexions and Tenfions of the lower Limbs, as under-propped by the curious frame of divers Articulated Bones, the Allodgmenrs and Bafes of numerous Mufcles, playing up and down, as lo many Engines of Mo= tron. Beforel treat of the Fabrick it felt, it may not be amifs to {peak Pomewhat of the Out-buildings, upon which the whole Frame of Mans Body is {up- The {lrufiure of Human: ported and moved. This molt excellent Struéture, being cotitpofed of three Ftories, is built Body 35mm- as it were upon two inverted Pyramidal Columns (greater above, and running more Taper downward) is made tip in a great mealilre of the Bones of the Thighs, Legs, and Feet; which divide theft: fine Pillars as it were into three moving Apartiments, wlrolb Centers are the upper Bones, which immediately confiitute every Articulation, and are the Hypomoclia in the Various Motions of the limbs. The main Preps of the firlt Story of the Pillars, are the Bones of the Thighs, adorned on their tops with Orbicular Heads, that they may play yofid ofrhrce Stories, erect» (ll upon inve- rl‘cd l'lramidal Pillars. The upp:r Bones making the different articulations, arc thclcveraI centers of Motion. relating to themvets parts of a Limb. more ealily in their Sockets, which are Framed orr the 0x Irt/Jium, Ilium, and The Bone of Thigh ‘Pubir, hollowed with one common Sinus, to which the round Heads are firm- Ill: playtfh ina ly conjoyncd on each fide, and in the middle, by the interpolition of two large ‘utkcf, tnwhich it is fli'ong Ligaments, the one being broad and Membranous, encirclcth the I‘m' glv affix/r ed by a do»- whole joint, and the other round, lpringing out of the Cavities 0f the bl: ligimcnt. Bones, is ilrongly inferred into the heads of the Thigh Bones, keeping them Cg from |
