2 1 6 The Complete Engliih T>ifpenfatory. Part II.

Now the Confequences whichare afcribed to a pleaiing Senfe ofthis Part, are only jaft the contraryof thefe which the oppofite Affec-tion of Pain induces. And indeed,Tieafure and Pain are two greatSprings of Anion in the AnimalOEconomy. The Changes theymake in the Fabric, are the Caufesof many Effects which feem fur-prizing, becaufc we do not regardthe Mechanifm by which they areproduced , but thefe muft be moreconfiderable in the Stomach, thanany where elfe ; this Part being, formany wife purpofes, of fo acute aFeeling, that fomc Philoibphers have,for this Reafon, thought it to bethe Seat of the Soul.

Beiides thefe Confiderations, itmay be taken notice, that the Sto-mach being diftended with Food,prefics upon the defcending Trunkof the Aorta, and thus caufes agreater Fulnefs of the Veifels in theupper Parts,- whereupon the Brainis loided, or the Derivation of Spi-rits into the Nerves diminifh'd, up-on which Unaci'wity or Droufiuefsenfues. From hence proceed tholèTlu/hings in the Face, Rednefs, &c.after plentiful eating and drinking,moil vilible in thofe whole Veifelsare lax and weak; as in exhauftedand heûic Ferions they more efpe-cially are. Thus we may, withoutthe alfiftance of the new Chyle en-tering into the Veflbls, account forthat Inclination to Sleep, which fol-lows upon a full Stomach, tho wemuft alfo allow theDiftenfion fromthis, to be a confiderable Caufe ofthe fame Effect. But this doe; nothappen immediately, nay fometimesperhaps not within two or threehours after eating; and the HiddenDroußnefi muft (as "weil as theprefent Refreffiment and Revivingwhich Meat gives) be chiefly ow-

ing to ibme more fpeedy Altera-tion.

Now to apply this more ftriftlyto the Contents of this Seiiion, itmay be neceffary to coniider yetmore nearly the Effects of an Ctyjtfieor Narcotic; firft upon the Stomach,and afterwards, when they havepafs'd the Prima Via, upon the ar-terial Fluid itfelf.

An agreeable Senfation producedin the Stomach, together with aDiftenfion of its Membranes, hasbeen already oblèrv'd to be theCaufe of that Sleepinefs, to whichwe are fo inclinable after eating.The one of thefe engages the Mind,ti'e other aûs upon the Body. ForPleaiure amufes the Soul as it were,fo that it does not think or exer-cife it felf about any outward Ob-jects ; that is, it is inclined to Reß :and the Fulnefs of the Veifels inthe Brain checks and hinders, inibme meaíüre, the Derivation ofthe nervous Juice into the Orgaçs.Now they who take a moderateDole of an Opiate, efpecially if notlong accuftom'd to fuch things, arefo traniported with the pleaiingSenfe it induces, that they are, asthey often expreß themfelves, inHeaven; and tho they do not al-ways fleep, (which proceeds fromthe Prefentation of pleaiing Imagesto the Mind being fo ftrong, thatlike Dreams they do over-engagethe Fancy, and fo interrupt the Stateof Reft) yet they do however en-joy fo perfect an Indolence andQuiet, that no Happinefs in theWoild can furpafs the Charms of foagreeable an Extafy.

Thus we have from thefe Medi-cines, but in a far more eminentdegree, all thofe Effects which wereobferv'd to follow upon that grate-ful Senfe in the Stomach, which» moderate Fulnefs produces. For

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