Receivedbytwoveryintelligentgentlemen，brothers，andpartnerswiththeirfatherintheconcern，andwhotestifiedeverydesiretoshowtheirworkstomefreely，Iwentoverthelead-mills。Thepurportofsuchworksistheconversionofpig-leadintowhite-
lead。Thisconversionisbroughtaboutbytheslowandgradualeffectingofcertainsuccessivechemicalchangesintheleaditself。Theprocessesarepicturesqueandinteresting，-themostso，beingtheburyingofthelead，atacertainstageofpreparation，inpots，eachpotcontainingacertainquantityofacidbesides，andallthepotsbeingburiedinvastnumbers，inlayers，undertan，forsometenweeks。
Hoppingupladders，andacrossplanks，andonelevatedperches，untilIwasuncertainwhethertolikenmyselftoabirdorabrick-
layer，Ibecameconsciousofstandingonnothingparticular，lookingdownintooneofaseriesoflargecocklofts，withtheouterdaypeepinginthroughthechinksinthetiledroofabove。A
numberofwomenwereascendingto，anddescendingfrom，thiscockloft，eachcarryingontheupwardjourneyapotofpreparedleadandacid，fordepositionunderthesmokingtan。Whenonelayerofpotswascompletelyfilled，itwascarefullycoveredinwithplanks，andthosewerecarefullycoveredwithtanagain，andthenanotherlayerofpotswasbegunabove；sufficientmeansofventilationbeingpreservedthroughwoodentubes。Goingdownintothecockloftthenfilling，Ifoundtheheatofthetantobesurprisinglygreat，andalsotheodouroftheleadandacidtobenotabsolutelyexquisite，thoughIbelievenotnoxiousatthatstage。Inothercocklofts，wherethepotswerebeingexhumed，theheatofthesteamingtanwasmuchgreater，andthesmellwaspenetratingandpeculiar。Therewerecockloftsinallstages；fullandempty，halffilledandhalfemptied；strong，activewomenwereclamberingaboutthembusily；andthewholethinghadrathertheairoftheupperpartofthehouseofsomeimmenselyricholdTurk，whosefaithfulseragliowerehidinghismoneybecausethesultanorthepashawascoming。