IX THE PAPER FIBRES

X THE X-RAY READER

XI THE SHOE-PRINTS

XII THE EVIL EYE

XIII THE POISONED CIGARETTE

XIV THE INTERFEROMETER

XV THE WEED OF MADNESS

XVI THE EAR IN THE WALL

XVII THE VOICE FROM THE AIR

XVIII THE ANTIDOTE

XIX THE BURGLAR POWDER

XX THE PULMOTOR

XXI THE TELESCRIBE

XXII THE VANISHER

XXIII THE ACETYLENE TORCH