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Show 0f the Nervous Liquor. The tontra< then of the Brain; Becki" Boo/k Ill. 0f t/Jc Mme: Liquor: infinuate it {elf into the minute Pores of the Brain, efpecially when it is con- upon one another, return to their more gentle, natural motion, and tinually prompted Forward by the fofter motion, and gentle cenfiriéhon of current. 1the Brain; which fome Learned men have not iaith enough to believe, dc. nying all morion to it ; but others moreCandid, fay it is only immovable of it felt, being notaéted with a proper natural motion, yet grant it an acci. dental one, proceeding only from the contraction and relaxation of the Ar. Li» quor, and its motion through the {everal Procefle s of the Brain, and its con~ rinuatiOU (the MeduIIa Spinalis) into the append ant Nerves, I conceive it teries; andthis is very evident toSenfe: It hath been often obferved in wounds of the Head, wherein the Brain being divefied of its Skull and more immediate Coats, its motion is mofi plainly dilcovered, which keeperh the fame order and meafure with the pulfiltion made in the Wrii't7 which if that be {lowly or hafiily performed, the motion of the Brain is commen. furate to it, and the Pulfe ceafing in the Wrifi, at the lame moment, the C‘JCll Having Treated of the Produétion and Propagation of .the AnimaL will not be ainils to give you a {hort account of the Ends of it, how the Animal Liquor ofliciateth with the Rational, and Senfitive Operations; how iris alio minif'terial to Mufcular motion, and Nutrition. The Soul of Man, the Divine Image, and Emprei} of the iciibr, the Epi~ tome oi the greater World, keepeth its Court and Tribunal in the {upream Brain is wholly deprived of motion. Orb of the Head, where (by the aflii'tance of fpirituous, {ubtlcf Particles, And I do mofi humbly conceive, that the Brain cannot only be 35th with an accidental motion, performed by contraction of the Arteries, the more refined parts of the Animal Liquor, aciuating the inward Reteiles of whereby the neighbouring parts of the Brain being tender, are jofled to and fro according to the vibration and relaxation of the confining Veiiels, but the Brain is alib capable of a natural motion, notWithi'tanding its (of: hit. ble fubfiance, which is interlaced and fupported with great Variety of Fibres, whole Interfiices are only filled up with a kind of white tender 'Parmby. TheCompch me, but a great part of its Compage is made up and embroidered with Meot' the Brain :5 Fihtuusas dullary fireaks, which I conceive are minute Fibrils, and efpecially the (orMCIlJS the Maui]; :pi- pum/iriam, as the two Origens of the Medu-lhz obiangam, whofe wholeBody 711m, as well as the Medulla Spinalit, is for the molt part as it were a Syliem of The Rrain as Fibres, the proper machines and natural infiruments of Motion, which beherons, is capath] or iii- ing of a {oft and tenacious temper, are flexible and pliant, capable of vavt‘rs motions. rious motions, contraciionnnd relaxation, though the lait is more remifs and mild, tending to an ac‘quiefcence in the refiiturion of them to their due i :nral Figure, becaufe in contraction the Fibres of the MellnIld oblon, Tome-what changing their poflures, fituation and dimenlions, are in a . 5y {mall degree rendred {hotter in length, thicker in depth, and crooked in figure, and being invigorated, grow tenfe and (tiff, gently curling to; wards the Origen of the Nerves, no ways difcompofing the delicateliruéture of the Brain; whence the Medulid, being a Compage of Fibres, is obnoxious to variety of tender motions, celebrated in many contraétions' perate aéts; The firi't confifting in the knowledge of its own nature and and relaxations, according to the frequent command or filence oi the Will, halting the mild {treams of Animal Liquor through the more firaight Ports of (mail Fibres into the freer Channels of greater Nerves. Some heavy Body, thrown into a collection of Waters, prerEntly dilhrtiers the Surface, giving them greater or lefs curled morions, the neighbour- ing drops waiting one another forward with more or 1er violence, 15 they are 216th with the more lefs prefling weight of the heavy Body, and at la"? the preilure of the weight growing faint , the motion of the Water is rendred weakcr, till it hath fmoothed it felf into a, natural and even current. ‘The Will being affected with the profecution of fame weight y 869d' difcompofeth the natural Surface of the Fibres of the Brain, by givmg them a curled figure in contraction, halting the motion of the Animi iquor more or lefs, according to the more or lefs pOWerful cdmands of the rational Appetite, which as they grow more remifs and ezfit. The Figure of the Fibres is more firaight, and refloted to their namril F" gure, and nfiighbouring drops of the Animal Liquor crowding WithlefsfolC; upo The Soul kez‘pt‘tli its (our: in the Head. the Brain) the more Divine Effence of Man celebrateth its Elicite and [ml Thtinor oi perfection in reflex acts, as alfo of the caufes of other Beings without it felt, is i, ,. artificially acquired in many different Sciences, fpecified by {eVeral Objects and deeper abfiraétions, made by fubtle Conceptions of the Underl'tanding -, and alfo the imperate aéts are performed by exalting the Mealnlla of the Brain withthe more pure part of the Animal Liquor, by whofe vertue the rational Appetite giveth its commands and controll to the Senfirive, to the lral‘ciblc and Concupifcible faculties, moderating and governing their different operations, the various Paflions of the inferior Appetite, which ought to fubmit to the more exact rule and conduéi of the rational Power. The Fancy being feared in the middle of the Brain, is fraught with Ani- mal Liquor, impregnated with VolatilSalt and Spirituous Particles, which render it in a fit capacity to exert the operations of the Fancy, to perceive and judge the nature and diliinétion of numerous Ideas , which making dif- The itat cf the Fancy. The oirrati‘ on: or 11, lcrentAppullEs upon the various Nerves of the Organs of outward Seufes‘,‘ a are thence derived to the Origen of the Nerves, to which the Fibres eyery Where adorning the Medu/la oblongata, are continued and reach to the Corpus Calla/m, the feat of the Fancy, as I humbly conceive. Lifarned Dr. Willis placeth the manner and reafon of Seni'atidn in the re- D 'ii'i'it his traction of the Animal Spirits, acted with the impreflions of fenlible Ob= or ..ucn abut: Mutation. jeéts. The words of this Excellent Aurhor are thefe ; Senfuuw ratio for/m:lir'ronfiflil in Spirinmm retrafiione, fin werfm famerfimr refluxu : "hitting; em'm "I'J‘fli ft'nfibilir imprcfl'io radiofaz [mic cont'extum infermr, flatim rm: tom com" "8'": dill illim" portio guide)", quire flacciem admittat, mature at retroaéia, («yea [W Wfilire infe ('9 rtccdere cagitur. But with the leave of this moit ingenious huthor, l cannot well apprehend how a Signature of a Senfible Object, Imprinted upon the Animal Spirits feated in the outward Organs of Senfe, €311 make them recoil towards their Origen, the Brain ; whereas the spirit". (f 35 ‘he more pure and exalted Particles edged in the Animal Liquor, have , -' the fame motion with it out of the Cortex, through the Medtil/a of the Brain in") the Trunks of the Nerves, afterward inferred into the Initrumcnts 0 the outward Seufes, from which (I humbly conceive) there can be "° RCflux toward the Brain; becaufe the Animal Liquor efpoufiug the Spirits: Asits pUrer and infeparable parts ( fireaminghom the ("flex 0f fhs‘ rain through the inward Proceffes) is [till carried forward by an impolite, tag-- :aule One part protrudetl'i another forward into the Interi'ticesot thet amen-rs 9f the Nerves, whofe more minute Pores are not capable ot reccivr. , If '1 Y :2 " ‘ |