6VI. The Detectaphone
140XVI. The Ear in the Wall
7VII. The Green Curse
141XVII. The Voice From the Air
8VIII. The Mummy Case
142XVIII. The Antidote
9IX. The Elixir of Life
143XIX. The Burglar Powder
10X. The Toxin of Death
144XX. The Pulmotor
11XI. The Opium Joint
145XXI. The Telescribe
12XII. The “Dope Trust”
146XXII. The Vanisher
13XIII. The Kleptomaniac
147XXIII. The Acetylene Torch
14XIV. The Crimeometer
148XXIV. The Police Dog
15XV. The Vampire
149XXV. The Gold of the Gods
16XVI. The Blood Test
150I. The Clutching Hand
17XVII. The Bomb Maker
151II. The Twilight Sleep
18XVIII. The “Coke” Fiend
152III. The Vanishing Jewels
19XIX. The Submarine Mystery
153IV. “the Frozen Safe”
20XX. The Wireless Detector
154V. The Poisoned Room
21XXI. The Ghouls
155VI. The Vampire
22XXII. The X-Ray “Movies”
156VII. The Double Trap
23XXIII. The Death House
157VIII. The Hidden Voice
24XXIV. The Final Day
158IX. The Death Ray
25Introduction
159X. The Life Current
26I. The War Terror
160XI. The Hour of Three
27II. The Electro-Magnetic Gun
161XII. The Blood Crystals
28III. The Murder Syndicate
162XIII. The Devil Worshippers
29IV. The Air Pirate
163XIV. The Reckoning
30V. The Ultra-Violet Ray
164I. The Serpent Sign
31VI. The Triple Mirror
165II. The Cryptic Ring
32VII. The Wireless Wiretappers
166III. The Watching Eye
33VIII. The Houseboat Mystery
167IV. The Vengeance of Wu Fang
34IX. The Radio Detective
168V. Shadows of War
35X. The Curio Shop
169VI. The Lost Torpedo
36XI. The “Pillar of Death”
170VII. The Gray Friar
37XII. The Arrow Poison
171VIII. The Vanishing Man
38XIII. The Radium Robber
172IX. The Submarine Harbor
39XIV. The Spinthariscope
173X. The Conspirators
40XV. The Asphyxiating Safe
174XI. The Wireless Detective
41XVI. The Dead Line
175XII. The Death Cloud
42XVII. The Paste Replica
176XIII. The Searchlight Gun
43XVIII. The Burglar's Microphone
177XIV. The Life Chain
44XIX. The Germ Letter
178XV. The Flash
45XX. The Artificial Kidney
179XVI. The Disappearing Helmets
46XXI. The Poison Bracelet
180XVII. The Triumph of Elaine
47XXII. The Devil Worshipers
181I. The Death-Dream
48XXIII. The Psychic Curse
182II. The Marble Heart
49XXIV. The Serpent's Tooth
183III. The Freud Theory
50XXV. The “Happy Dust”
184IV. The “Hesitation Complex”
51XXVI. The Binet Test
185V. The Psychanalysis
52XXVII. The Lie Detector
186VI. The “Other Woman”
53XXVIII. The Family Skeleton
187VII. The Crook Detective
54XXIX. The Lead Poisoner
188VIII. The Poisoned Glass
55XXX. The Electrolytic Murder
189IX. The Association Test
56XXXI. The Eugenic Bride
190X. The Ordeal Bean
57XXXII. The Germ Plasm
191XI. The Rascon Reports
58XXXIII. The Sex Control
192XII. The “New Morality”
59XXXIV. The Billionaire Baby
193XIII. The Mechanical Ear
60XXXV. The Psychanalysis
194XIV. The “Jung” Method
61XXXVI. The Ends of Justice
195XV. The Conflicting Clues
62I. The Social Gangster
196XVI. The Finesse
63II. The Cabaret Rouge
197XVII. The Suppressed Desire
64III. The Fox Hunt
198XVIII. The Confession
65IV. The Tango Thief
199XIX. The Lie-Detector
66V. The “The Dansant”
200XX. The Soul Scar
67VI. The Serum Diagnosis
201I. A Camera Crime
68VII. The Diamond Queen
202II. The Tiny Scratch
69VIII. The Anesthetic Vaporizer
203III. Tangled Motives
70IX. The Twilight Sleep
204IV. The Fatal Script
71X. The Sixth Sense
205V. An Emotional Maze
72XI. The Infernal Machines
206VI. The First Clue
73XII. The Submarine Bell
207VII. Enid Faye
74XIII. The Super-Toxin
208VIII. Lawrence Millard
75XIV. The Secret Agents
209IX. White-Light Shadows
76XV. The Germ of Anthrax
210X. Chemical Research
77XVI. The Sleepmaker
211XI. Forestalled
78XVII. The Inter-Urban Handicap
212XII. Emery Phelps
79XVIII. The Toxin of Fatigue
213XIII. Marilyn Loring
80XIX. The X-Ray Detective
214XIV. Another Clue
81XX. The Mechanical Connoisseur
215XV. I Become a Detective
82XXI. The Radiograph Witness
216XVI. Enid Assists
83XXII. The Absolute Zero
217XVII. An Appeal
84XXIII. The Vacuum Bottle
218XVIII. The Antivenin
85XXIV. The Solar Plexus
219XIX. Around the Circle
86XXV. The Demon Engine
220XX. The Banquet Scene
87XXVI. The Electrolysis Clew
221XXI. Merle Shirley Overacts
88XXVII. The Perpetual Motion Machine
222XXII. The Stem
89XXVIII. The Cancer House
223XXIII. Botulin Toxin
90XXIX. The Quack Doctors
224XXIV. The Invisible Menace
91XXX. The Filterable Virus
225XXV. Itching Salve
92XXXI. The Voodoo Mystery
226XXVI. A Cigarette Case
93XXXII. The Fluoriscine Test
227XXVII. The Film Fire
94XXXIII. The Respiration Calorimeter
228XXVIII. The Phosphorus Bomb
95XXXIV. The Evil Eye
229XXIX. Microscopic Evidence
96XXXV. The Buried Treasure
230XXX. The Ballroom Scene
97XXXVI. The Weed of Madness
231XXXI. Physostigmin
98I. The Vanisher
232XXXII. Camera Evidence
99II. The Black Book
233The Silent Bullet
100III. The Safe Robbery
234The Scientific Cracksman
101IV. The Anonymous Letter
235The Bacteriological Detective
102V. The Suffragette Secretary
236The Deadly Tube
103VI. The Woman Detective
237The Seismograph Adventure
104VII. The Gang Leader
238The Diamond Maker
105VIII. The Shyster Lawyer
239The Azure Ring
106IX. The Jury Fixer
240“Spontaneous Combustion”
107X. The Afternoon Dance
241The Terror in the Air
108XI. The Typewriter Clue
242The Black Hand
109XII. The “Portrait Parle”
243The Artificial Paradise
110XIII. The Conviction
244The Steel Door
111XIV. The Beauty Parlour
245The Poisoned Pen
112XV. The Phantom Circuit
246The Yeggman
113XVI. The Sanitarium
247The Germ of Death
114XVII. The Society Scandal
248The Firebug
115XVIII. The Wall Street Wolf
249The Confidence King
116XIX. The Escape
250The Sand-Hog
117XX. The Metric Photograph
251The White Slave
118XXI. The Morgue
252The Forger
119XXII. The Canard
253The Unofficial Spy
120XXIII. The Confession
254The Smuggler
121XXIV. The Debacle of Dorgan
255The Invisible Ray
122XXV. The Blood Crystals
256The Campaign Grafter
123XXVI. The White Slave
257The Treasure-Train
124XXVII. The Election Night
258The Truth-Detector
125I. The Peruvian Dagger
259The Soul-Analysis
126II. The Soldier of Fortune
260The Mystic Poisoner
127III. The Archaeological Detective
261The Phantom Destroyer
128IV. The Treasure Hunters
262The Beauty Mask
129V. The Wall Street Promoter
263The Love Meter
130VI. The Curse of Mansiche
264The Vital Principle
131VII. The Arrow Poison
265The Rubber Dagger
132VIII. The Anonymous Letter
266The Submarine Mine
133IX. The Paper Fibres
267The Gun-Runner
134X. The X-Ray Reader
268The Sunken Treasure
