AfterBorrihadbeenaboutelevenyearsinconfinement，asmallvolumewaspublishedatCologne，entitled“TheKeyoftheCabinetoftheChevalierJosephFrancisBorri；inwhicharecontainedmanycuriousLettersuponChemistryandotherSciences，writtenbyhim；
togetherwithaMemoirofhisLife。“ThisbookcontainedacompleteexpositionoftheRosicrucianphilosophy，andaffordedmaterialstotheAbbedeVillarsforhisinteresting“CountdeGabalis，“whichexcitedsomuchattentionatthecloseoftheseventeenthcentury。
BorrilingeredintheprisonofSt。Angelotill1695，whenhediedinhiseightiethyear。Besides“TheKeyoftheCabinet，“writtenoriginallyinCopenhagen，in1666，fortheedificationofKingFredericIII，hepublishedaworkuponalchymyandthesecretsciences，underthetitleof“TheMissionofRomulustotheRomans。“
INFERIORALCHYMISTSOFTHESEVENTEENTHCENTURY。
Besidesthepretenderstothephilosopher’sstonewhoseliveshavebeenalreadynarrated，thisandtheprecedingcenturyproducedagreatnumberofwriters，whoinundatedliteraturewiththeirbooksuponthesubject。Infact，mostofthelearnedmenofthatagehadsomefaithinit。VanHelmont，Borrichius，Kirchen，Boerhaave，andascoreofothers，thoughnotprofessedalchymists，werefondofthescience，andcountenanceditsprofessors。Helvetius，thegrandfatherofthecelebratedphilosopherofthesamename，assertsthathesawaninferiormetalturnedintogoldbyastranger，attheHague，in1666。