Sed. 8.

cuanba, tho it may appear verybrisk in its Operation, leaves ge-nerally behind it but an Aítriítionof the Parts it had before open'dand fatigued. He made a refinousExtrait with Spirit of Wine, andthen drew out the faline Parts withRain-Water, and found by Expe-rience, that its Violence, as in moilother Turgers, was owing to itsRefíü. For the Effects of the Refinwere more violent than the RootJtfelf, leaving little or no Aftrictionafterward; but the iàline Extractwas Diuretic, purg'd gently with-out anyor little Naufeouihefs; andin fhort, had the fpecific Qualityof the Root, that is, to cure Dy-fenteries.

Thus far vye thought proper tofollow our Trench Guide, wholeExperiments give a good Infightinto the Contexture and Virtues ofthis Root. But the common Prac-tice here makes any Preparations ofit little needed, it being rrioft e-ileem'd and prefcrib'd in Subftance.Its Dole is from ten Grains to two

Of Cathartics.

191

Scruples ; Come give a Dram, but itwill not fail to work in alefs quantitywith proper Management.

Minerals.

4^3. Borax, Horace, is theSanterna of Pliny ; and we haveof it two kinds, Native and Facti-tious. The Native is only theChryfecolla or Tincal, calcined, dif-folved, and cryftallized. There arealfo two kinds; of the Factitious, onemade of Nitre and Urine, and theother with an addition of morethings, which maybe feen in Schro-der, but it is now neglected. Itsufe in Medicine is but little. Takenalone in Pouder, it provokes to vo-mit; but 'tis feldom us'd for thatpurpofè. Mixed with any warmAromatic, it has no fuch Effect inthe Stomach; but is reckon'd ofIbme Efficacy in sfiifting Delivery,and is by our Midlives frequentlyadminifler'd with a Drop or two ofOil of Cinnamon, for that end. It isalio fometimes ufed in Gargartfms.

SECT. VIII.Of Cathartics.

SOmewhat may be underftoodconcerning the Operation ofCathartics, from what has beenalready faid about Emetics ; the Vel-licatipn or Irritation of the Fibresand Membranes being the fame inboth. But as the Difference of theParts in which their Scenes of Ac-tion are, makes a great deal of Dif-ference in the Confequences oftheir Operation on many accounts;therefore it may be furtfip neceffary

to know what a Stimulus will da,in the Inteflines particularly.

The Teriftaltic or Vermicular Mo-tion of the Guts, is fuch as continu-ally propels forwards their Contents,from the Vylorus down to the Rec-tum. Now every Irritation eitherquickens that Motion in its naturalOrder, or occasions fome little In-verfions of it.* In both, what butflightly adhered to che Coats, orinner Membranes, will be looien'd

and