IndefaultofapoisonjarwhichIwouldhaveplacedononesideanddrawnuponatmyconvenience，Idetachthelastsegment，formingthebaseofthesting。Iobtainitfromadeadandalreadywitheredscorpion。Awatchglassservesasabasin。Here，Itearandcrushthepieceinafewdropsofwaterandleaveittosteepforfour—and—twentyhours。TheresultistheliquidwhichI
proposetousefortheinoculation。Ifanypoisonremainedinmyanimal’scaudalgourd，theremustbeatleastsometracesofitintheinfusioninthewatchglass。
Myhypodermicsyringeisofthesimplest。Itconsistsofalittleglasstube，taperingsharplyatoneend。Bydrawinginmybreath，Ifillitwiththeliquidtobetested;Iexpelthecontentsbyblowing。ItspointisalmostasfineasahairandenablesmetoregulatethedosetothedegreewhichIwant。Acubicmillimeteristheusualcharge。Theinjectionhastobemadeatpartsthataregenerallycoveredwithhorn。Soasnottobreakthepointofmyfragileinstrument，Ipreparethewaywithaneedle，withwhichIprickthevictimatthespotrequired。IinsertthetipoftheloadedinjectorintheholethusmadeandIblow。Thethingisdoneinamoment，veryneatlyandinanorthodoxfashion，favorabletodelicateexperiments。Iamdelightedwithmymodestapparatus。
Iamequallydelightedwiththeresults。Thescorpionhimself，whenwoundingwithhissting，inwhichthepoisonisnotdilutedasmineisinthewatchglass，wouldnotproduceeffectslikethoseofmypricks。Hereissomethingmorebrutal，producingmoreconvulsioninthesufferer。Thevirusofmycontrivingexcelsthescorpion’s。
Thetestisseveraltimesrepeated，alwayswiththesamemixture，which，dryingupbyspontaneousevaporation，thenmadetoserveagainbytheadditionofafewdropsofwater，oncemoredrainedandoncemoremoistened，doesdutyforanindefinitelengthoftime。Insteadofabating，thevirulenceincreases。Moreover，thecorpsesoftheinsectsoperateduponundergoacuriouschange，unknowninmyearlierobservations。Thenthesuspicioncomestomethattheactualpoisonofthescorpiondoesnotenterintothematteratall。WhatIobtainwiththeendjointofthetail，withtheglandatthebaseofthesting，Ioughttoobtainwithanyotherpartoftheanimal。