had　perhaps　seen　once　in　his　life。
  〃Poor　Robert！〃　continued　the　young　reporter；　〃this　dreadful　affair
  may　be　his　death；　…　he　is　so　deeply　in　love　with　Mademoiselle
  Stangerson。〃
  〃His　sufferings　are　truly　painful　to　witness；〃　escaped　like　a　regret
  from　the　lips　of　Monsieur　de　Marquet。
  〃But　it　is　to　be　hoped　that　Mademoiselle　Stangerson's　life　will　be
  saved。〃
  〃Let　us　hope　so。　　Her　father　told　me　yesterday　that；　if　she　does　not
  recover；　it　will　not　be　long　before　he　joins　her　in　the　grave。　　What
  an　incalculable　loss　to　science　his　death　would　be！〃
  〃The　wound　on　her　temple　is　serious；　is　it　not？〃
  〃Evidently；　but；　by　a　wonderful　chance；　it　has　not　proved　mortal。
  The　blow　was　given　with　great　force。〃
  〃Then　it　was　not　with　the　revolver　she　was　wounded；〃　said
  Rouletabille；　glancing　at　me　in　triumph。
  Monsieur　de　Marquet　appeared　greatly　embarrassed。
  〃I　didn't　say　anything　…　I　don't　want　to　say　anything　…　I　will　not
  say　anything；〃　he　said。　　And　he　turned　towards　his　Registrar　as　if
  he　no　longer　knew　us。
  But　Rouletabille　was　not　to　be　so　easily　shaken　off。　　He　moved
  nearer　to　the　examining　magistrate　and；　drawing　a　copy　of　the
  〃Matin〃　from　his　pocket；　he　showed　it　to　him　and　said：
  〃There　is　one　thing；　Monsieur；　which　I　may　enquire　of　you　without
  committing　an　indiscretion。　　You　have；　of　course；　seen　the　account
  given　in　the　'Matin'？　　It　is　absurd；　is　it　not？〃
  〃Not　in　the　slightest；　Monsieur。〃
  〃What！　　The　Yellow　Room　has　but　one　barred　window　…　the　bars　of
  which　have　not　been　moved　…　and　only　one　door；　which　had　to　be
  broken　open　…　and　the　assassin　was　not　found！〃
  〃That's　so；　monsieur；　…　that's　so。　　That's　how　the　matter　stands。〃
  Rouletabille　said　no　more　but　plunged　into　thought。　　A　quarter　of
  an　hour　thus　passed。
  Coming　back　to　himself　again　he　said；　addressing　the　magistrate：
  〃How　did　Mademoiselle　Stangerson　wear　her　hair　on　that　evening？〃
  〃I　don't　know；〃　replied　Monsieur　de　Marquet。
  〃That's　a　very　important　point；〃　said　Rouletabile。　　〃Her　hair　was
  done　up　in　bands；　wasn't　it？　　I　feel　sure　that　on　that　evening；　the
  evening　of　the　crime；　she　had　her　hair　arranged　in　bands。〃
  〃Then　you　are　mistaken；　Monsieur　Rouletabile；〃　replied　the
  magistrate；　〃Mademoiselle　Stangerson　that　evening　had　her　hair　drawn
  up　in　a　knot　on　the　top　of　her　head；　…　her　usual　way　of　arranging　it
  …　her　forehead　completely　uncovered。　　I　can　assure　you；　for　we　have
  carefully　examined　the　wound。　　There　was　no　blood　on　the　hair；　and
  the　arrangement　of　it　has　not　been　disturbed　since　the　crime　was
  committed。〃
  〃You　are　sure！　　You　are　sure　that；　on　the　night　of　the　crime；　she
  had　not　her　hair　in　bands？〃
  〃Quite　sure；〃　the　magistrate　continued；　smiling；　〃because　I
  remember　the　Doctor　saying　to　me；　while　he　was　examining　the　wound；
  'It　is　a　great　pity　Mademoiselle　Stangerson　was　in　the　habit　of
  drawing　her　hair　back　from　her　forehead。　　If　she　had　worn　it　in
  bands；　the　blow　she　received　on　the　temple　would　have　been　weakened。'
  It　seems　strange　to　me　that　you　should　attach　so　much　importance
  to　this　point。〃
  〃Oh！　　if　she　had　not　her　hair　in　bands；　I　give　it　up；〃　said
  Rouletabille；　with　a　despairing　gesture。
  〃And　was　the　wound　on　her　temple　a　bad　one？〃　he　asked　presently。
  〃Terrible。〃
  〃With　what　weapon　was　it　made？〃
  〃That　is　a　secret　of　the　investigation。〃
  〃Have　you　found　the　weapon　…　whatever　it　was？〃
  The　magistrate　did　not　answer。
  〃And　the　wound　in　the　throat？〃
  Here　the　examining　magistrate　readily　confirmed　the　decision　of　the
  doctor　that；　if　the　murderer　had　pressed　her　throat　a　few　seconds
  longer；　Mademoiselle　Stangerson　would　have　died　of　strangulation。
  〃The　affair　as　reported　in　the　'Matin；'　〃　said　Rouletabille　eagerly；
  〃seems　to　me　more　and　more　inexplicable。　　Can　you　tell　me；　Monsieur；
  how　many　openings　there　are　in　the　pavilion？　　I　mean　doors　and
  windows。〃
  〃There　are　five；〃　replied　Monsieur　de　Marquet；　after　having　coughed
  once　or　twice；　but　no　longer　resisting　the　desire　he　felt　to　talk
  of　the　whole　of　the　incredible　mystery　of　the　affair　he　was
  investigating。　　〃There　are　five；　of　which　the　door　of　the　vestibule
  is　the　only　entrance　to　the　pavilion；　…　a　door　always　automatically
  closed；　which　cannot　be　opened；　either　from　the　outer　or　inside；
  except　with　the　two　special　keys　which　are　never　out　of　the
  possession　of　either　Daddy　Jacques　or　Monsieur　Stangerson。
  Mademoiselle　Stangerson　had　no　need　for　one；　since　Daddy　Jacques
  lodged　in　the　pavilion　and　because；　during　the　daytime；　she　never
  left　her　father。　　When　they；　all　four；　rushed　into　The　Yellow　Room；
  after　breaking　open　the　door　of　the　laboratory；　the　door　in　the
  vestibule　remained　closed　as　usual　and；　of　the　two　keys　for　opening
  it；　Daddy　Jacques　had　one　in　his　pocket；　and　Monsieur　Stangerson
  the　other。　　As　to　the　windows　of　the　pavilion；　there　are　four；　the
  one　window　of　The　Yellow　Room　and　those　of　the　laboratory　looking
  out　on　to　the　country；　the　window　in　the　vestibule　looking　into
  the　park。〃
  〃It　is　by　that　window　that　he　escaped　from　the　pavilion！〃　cried
  Rouletabille。
  〃How　do　you　know　that？〃　demanded　Monsieur　de　Marquet；　fixing　a
  strange　look　on　my　young　friend。
  〃We'll　see　later　how　he　got　away　from　The　Yellow　Room；〃　replied
  Rouletabille；　〃but　he　must　have　left　the　pavilion　by　the　vestibule
  window。〃
  〃Once　more；　…　how　do　you　know　that？〃
  〃How？　　Oh；　the　thing　is　simple　enough！　　As　soon　as　he　found　he　could
  not　escape　by　the　door　of　the　pavilion　his　only　way　out　was　by　the
  window　in　the　vestibule；　unless　he　could　pass　through　a　grated　window。
  The　window　of　The　Yellow　Room　is　secured　by　iron　bars；　because　it
  looks　out　upon　the　open　country；　the　two　windows　of　the　laboratory
  have　to　be　protected　in　like　manner　for　the　same　reason。　　As　the
  murderer　got　away；　I　conceive　that　he　found　a　window　that　was　not
  barred；　…　that　of　the　vestibule；　which　opens　on　to　the　park；　…　that
  is　to　say；　into　the　interior　of　the　estate。　　There's　not　much　magic
  in　all　that。〃
  〃Yes；〃　said　Monsieur　de　Marquet；　〃but　what　you　have　not　guessed　is
  that　this　single　window　in　the　vestibule；　though　it　has　no　iron　bars；
  has　solid　iron　blinds。　　Now　these　iron　blinds　have　remained　fastened
  by　their　iron　latch；　and　yet　we　have　proof　that　the　murderer　made
  his　escape　from　the；　pavilion　by　that　window！　　Traces　of　blood　on
  the　inside　wall　and　on　the　blinds　as　well　as　on　the　floor；　and
  footmarks；　of　which　I　have　taken　the　measurements；　attest　the　fact
  that　the　murderer　made　his　escape　that　way。　　But　then；　how　did　he
  do　it；　seeing　that　the　blinds　remained　fastened　on　the　inside？　　He
  passed　through　them　like　a　shadow。　　But　what　is　more　bewildering
  than　all　is　that　it　is　impossible　to　form　any　idea　as　to　how　the
  murderer　got　out　of　The　Yellow　Room；　or　how　he　got　across　the
  laboratory　to　reach　the　vestibule！　　Ah；　yes；　Monsieur　Rouletabille；
  it　is　altogether　as　you　said；　a　fine　case；　the　key　to　which　will
  not　be　discovered　for　a　long　time；　I　hope。〃
  〃You　hope；　Monsieur？〃
  Monsieur　de　Marquet　corrected　himself。
  〃I　do　not　hope　so；　…　I　think　so。〃
  〃Could　that　window　have　been　closed　and　refastened　after　the　flight
  of　the　assassin？〃　asked　Rouletabille。
  〃That　is　what　occurred　to　me　for　a　moment；　but　it　would　imply　an
  accomplice　or　accomplices；　…　and　I　don't　see　…〃
  After　a　short　silence　he　added：
  〃Ah　…　if　Mademoiselle　Stangerson　were　only　well　enough　to…day　to
  be　questioned！〃
  Rouletabille　following　up　his　thought；　asked：
  〃And　the　attic？　　…　There　must　be　some　opening　to　that？〃
  〃Yes；　there　is　a　window；　or　rather　skylight；　in　it；　which；　as　it
  looks　out　towards　the　country；　Monsieur　Stangerson　has　had　barred；
  like　the　rest　of　the　windows。　　These　bars；　as　in　the　other　windows；
  have　remained　intact；　and　the　blinds；　which　naturally　open　inwards；
  have　not　been　unfastened。　　For　the　rest；　we　have　not　discovered
  anything　to　lead　us　to　suspect　that　the　murderer　had　passed　through
  the　attic。〃
  〃It　seems　clear　to　you；　then；　Monsieur；　that　the　murderer　escaped
  …　nobody　knows　how　…　by　the　window　in　the　vestibule？〃
  〃Everything　goes　to　prove　it。〃
  〃I　think　so；　too；〃　confessed　Rouletabille　gravely。
  After　a　brief　silence；　he　continued：
  〃If　you　have　not　found　any　traces　of　the　murderer　in　the　attic；　such
  as　the　dirty　footmarks　similar　to　those　on　the　floor　of　The　Yellow
  Room；　you　must　come　to　the　conclusion　that　it　was　not　he　who　stole
  Daddy　Jacques's　revolver。〃
  〃There　are　no　footmarks　in　the　attic　other　than　those　of　Daddy
  Jacques　himself；〃　said　the　magistrate　with　a　significant　tum　of　his
  head。　　Then；　after　an　apparent　decision；　he　added：　〃Daddy　Jacques
  was　with　Monsieur　Stangerson　in　the　laboratory　…　and　it　was　lucky
  for　him　he　was。〃
  〃Then　what　part　did　his　revolver　play　in　the　tragedy？　…　It　seems
  very　clear　that　this　weapon　did　less　harm　to　Mademoiselle　Stangerson
  than　it　did　to　the　murderer。〃
  The　magistrate　made　no　reply　to　this　question；　which　doubtless
  embarrassed　him。　　〃Monsieur　Stangerson；〃　he　said；　〃tells　us　that　the
  two　bullets　have　been　found　in　The　Yellow　Room；　one　embedded　in　the
  wall　stained　with　the　impression　of　a　red　hand　…　a　man's　large　hand
  …　and　the　other　in　the　ceiling。〃
  〃Oh！　　oh！　　in　the　ceiling！〃　muttered　Rou