andkeepaguardonyourtongue。”
Thedooropened，andfourmenentered。OnewasanoldmanwhomI
hadnotseenbefore；intheotherthreeIrecognizedtheworkman-likefootman，andthetwosinisterartisanswhomIhadmetatthehouse-gate。Theyallstarted，guiltilyenough，atseeingme。
\"Letmeintroduceyou，\"saidthedoctor，takingmebythearm。
\"OldFileandYoungFile，MillandScrew——Mr。FrankSoftly。Wehavenicknamesinthisworkshop，Mr。Softly，derivedhumorouslyfromourprofessionaltoolsandmachinery。Whenyouhavebeenherelongenough，youwillgetanickname，too。Gentlemen，\"hecontinued，turningtotheworkmen，\"thisisanewrecruit，withaknowledgeofchemistrywhichwillbeusefultous。Heisperfectlywellawarethatthenatureofourvocationmakesussuspiciousofallnewcomers，andhe，therefore，desirestogiveyoupracticalproofthatheistobedependedon，bymakinghalf-a-crownimmediately，andsendingthesameup，alongwithourhandiwork，directedinhisownhandwriting，toourestimablecorrespondentsinLondon。Whenyouhaveallseenhimdothisofhisownfreewill，andtherebyputhisownlifeascompletelywithinthepowerofthelawaswehaveputours，youwillknowthatheisreallyoneofus，andwillbeundernoapprehensionsforthefuture。Takegreatpainswithhim，andassoonasheturnsoutatolerablyneatarticle，fromthesimpleflattedplates，underyourinspection，letmeknow。Ishalltakeafewhours\'reposeonmycamp-bedinthestudy，andshallbefoundtherewheneveryouwantme。”