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Show ()f the Cortex of the (Bi'fltfl. 99 8 L, , BookHL . "late": Channl‘l57 without the danger‘of loling its volatildelicate Patricio; whereupon Nature hath confined it wrthinfome fmall Pores, lor its gruattt fecurity; and becaufe it is requilite the Brain lliould be fupplied ivith a due proportion of nutricions Liquor, not only difpenfed in an equal lurfaee, but that the Rilings and Fallings of it would be garnilhed With Various deep Interfgétions, that their fecret fpaces may be more enlarged, to give "em reception to the Alimentary Liquor. , ' Another reafnn may be given of the lnteftinc Flcxlii‘es of the Brain) to ‘ "grail:C receive more minute Vellels into their foft embraces to leeure them from our. "mi" "it ward accidents, and the brisket motions of the Head. And above all (351 humbly conceive ) thefe Circumvolutions were made by a Divine Hand, to convey the Capillary Vellels of Arteries and Veins in Matandcrs, to give the \ital Liquor a fofter current through the Winding Valleys, that when the fli'eams of Blood are imported to the fubftance ofthe Brain, a fecretion may be made of the SHKK‘IIA" nutrioim from the florid part of the Blood, which could no way be well performed, if the Blood were hurried through the fubllanee of the Brain, with an over-hality torrent. ' The Cineritious part of the Brain doth not only fuperfieially invtll, asthe "mi "N, Emit doth cum-3p the wood of the Tree, but part of the Cortex (as it may. $181", , be calilv diltovered in the tliflbélion of diverfe more perfeét Animals) isfeat them. The outward furface of it is elegantly enameled with great and numerous branches of Arteries and Veins, and is cut into deep trenches. The repofitoriesofthefe VelTels, and of divers tranfparent Velicles, lodged both about the Surface, and in the Furtows of it. In a Humane Brain divefied of the Skull,between and upon the Anfmflm ngqs wt» and Marauders, running pleafantly both in the anterior and pofierior Region iiiiinéeihtilj; of the Brain; [plainly difcerned Veflels very much difiended with a tranl- fiffjfmh" rcncy, proceedcth from the beams of Light, which being thin and fpirituous, are ealily tranfmitted through the Pores of a loofe fluid Body. Surface, as in the Brain, bur retirerh it fell through the more inward Receifes ofthe Medal/rt Spinalir, which are encompalled with it. But in the CCTCbL'IllHU as well as the Brain, this Cineritious body plainly ppeareth, and its productions like thin Lamina: overfpreading the Cerebellaw, are propagated over its fubllance, refembling a feminircular Figure. But "what may fpeak the nature of this Cineritious fubfiance is very hard Thefe velfels being fwelled with a thin ferous Liquor, were very protu~ rix-rigurenr berant, as lo many Velicles of différent files and fhapes, forne globular, tome :ffc'fwm" oval,I or triangular , mida. others quadrangular , (Parallelogramr, or Pyra~ In fome Vefléls, the tranfparcnt Veficles, fraught with ferous Aereal Juyce, run allalong a good way like Beads, being numerous, fmall, orbicular Bo- dies. Thefe bubbles are molt confpicuous alfo in the Brain of a. Calf, Sheep, and other perfect Animals, and are lodged in the @ia Mater and Surface of the Cortex about their Veflels. to determine 3 I conceive it not altogether improbable to be a Compagc made in fome fort of Red concreted Blood, adhering to the Intel‘lllCGS Ol furnifhed toward the Ambient parts with variety of Bubbles, or ferous Ve- (13:33,, the Veiielsg as the Li\CI‘ is formed in relation to its Red filbfltanCC, as {01113 "ill haie it: But] apprehend the fubftance of the Cortex to be naturally ""CY, and are endued with feveral lhapes and files. The (i‘ie'll‘ of ytth its :ll'LL'I‘RIiOD in colour, from an innumerable company of fmall fanguine- "051"" (mm nus Velles, which difpnfe the more delicate part of the Blood, into the fllb'. Eclfzf,l‘,§‘ll‘c':,,_ fiance oi" the Brain, making no long fray in the Cortex, giveth it a BlUlh 0‘ "ImiPurple, retaining foincwhat ofthc tinéture of Blood, and fomewharolifG White primitive colonrof the Brain, giving it a mixed colour, making the the Cum: The Dara Mater, and not the Pin and Cortex of the Brain ofa Doe, is Thefcrops ficles "l- infpired with Air,which are moli confpicuous in their great Tranfpa- '33:: F. L Lines, parting thofe White concreted Globules, being ( as I apprehend) The which I conjeaure to be part of the Chyme , not aflimilated into Blood, Whofe Compagc beingloofened in time‘of Life, the purer Particles 0ftlle more fluid ferous Liquor, are in a difpofition to be fecerned from the Ed Craffament, when they are tranfmitted into the Cortical Glands. plaineth the nature of the Cortex with a familiar inl'tance, rcfembling the variety V, the Fir-fl rudiment of the Animal liquor. So that in diverfe Velfels are lodg- 5:53;; ed, many White confolidated Bodies of different Forms and bilagnitudes, ingenious Afla/jtiglrmr pleafeth himfelfin a kind of defcription of thC CV" "1:7 38 1t_i= an aggregate Body, compofed of a great number of minute Glands, lo finely adapted. and curioully conjoyned: that they feem to malt? up one continued body 5 They have (faith this great Author) an Oval FF gure, and loinewhat compreffed by lying one upon another; whence Proceed ltrud‘ture cl 9. Pomegranate, whofe well compofed frame, derived fi‘Omlthc m r. I difcerned alfo through the Coats of the Cortical Veflels, fome Particles (aslconceive) of the ferous Liquor, appearing in fmall round White Bodies, coagulated in the mails of Blood, which were confined within Red White in fomc fort Livefcent, which is a kind of Alli-colour. ,.:~c diver: Obtufe Angles, and yet are laid in fuch an excellent order, that they oft Consx give-a lurid of evennefs to many intermedial fpaces. And he farther CX' " fubl'tance, whofe thin Proceffes are fo inlinuated into each other, and lo intimately confederated, that it is impoliible by the power of Art to {ever parent Liquor embodied with Air; the molt eminent caufe of its Tranlpa- V\"liite,;~.nd of the fame colour with the other Proceffcs ofthe Brain,andrccci- )ch Cum s variety of grains firly united, feetneth to reprefent the Cortex of the Brain, and the minute Fibres fprouting from every grain, and prepagated through their Membranes, feem to give a rough draUght of the (max. And the Author farther confirmeth his Opinion , with an illuflration ta. ken from the obfervarion oer. 701m "Pfil, who in the diellElion ofa Brain, difcovered a lione, and globular Figure, like a Mulberry, compounded of many very little Alli-coloured Stones; it being probable, (faith he) that the Stone Was formed of a putrified part of the Cortex of the Brain, retain, ing the natural Figure of the Glands. The Cortex of the Brain is curioully framed ofa, Cortical and Medullary VCIitliClc'F, and principally near the Origen of the Spizza/ir Met/u/IJ, where gated in a long Traci through the Medal/a Spindle, nor coveringits outward a 0f the Cortex of the ram". ed allo about the Corpus Cal/(Wm ; and alfo part ofit is propagated to the the Mcdullary fubltance oi the Brain is encircled with thin Alli-coloured veils, and ionic prominenccs of the Ventricles are partly made up of the Cineritious fnbflance, which doth not only continue in the Brain, but is alfo propa- maku-zr, goo-k III. Whereupon [ am induced upon probable ground to believe, that the ner- hum-rm V0115 Liquor receiveth its Mater-i4 fnbflmm from the more delicate Particles of ,Ig'ili‘c‘ir'ihc the Chyme, and fetous Liquor , fevered from the Purple Liquor in the $fi:¢;§"ig. b9d)' 0f the Cortical Glands, where it encountreth the more pure parts of Blood- ": tranfmitted into thefe excellent Colatorie=, the great infiruments in the Production of the nervous Liquor. . Z i1 The |