I
The protagonist, presented at the Royal Geographical Society, whose daring balloon expedition is announced.
II
The intrepid discoverer whose balloon expedition across Africa is announced; he becomes the lion of the day, affably giving information but refusing all offers of partnership or mechanical guidance systems.
III
The doctor reveals his secret plan to cross Africa by balloon, defending it with logical arguments and fatalistic philosophy.
IV
Carefully studies the explorations of Barth, Burton, and Speke to plan his aerial route.
Chapter V
Energetically pushes preparations for departure, studies Arab language and Mandingoe idioms, and argues with Kennedy about the necessity of their expedition.
A Servant—Match Him!
The doctor calmly oversees the weighing ceremony and notes the weights of his companions for the balloon's balance. He remains composed amid the debate between Joe and Kennedy.
Geometrical Details and Preparations
The doctor is deeply engaged in the geometrical and technical details of the balloon, calculating its capacity, weight, and the innovative double-receptacle design.
VIII
Calm and methodical, overseeing preparations and holding scientific lectures on board.
IX
Lectures the officers on aerostatic science and reveals his secret method for controlling the balloon's altitude without expending gas.
The Doctor's Secret Apparatus Revealed
Delivers a detailed technical discourse on his balloon apparatus, explaining the principles of gas dilation and contraction for controlled flight.
XI
Leads the expedition, remains calm and determined despite the gloomy atmosphere.
Chapter XII
Takes bearings, consults maps, recounts Maizan's death, and manages the balloon's ascent.
XIII
Cures Kennedy's fever by ascending above the clouds; navigates the balloon skillfully over mountainous terrain; takes notes and designs of the mountains.
XIV
Defends the balloon from baboons with rifle fire, navigates the Victoria, keeps watch at night, decides to halt at Jihoue-la-Mkoa for water.
Chapter XV
Visits the sultan, administers cordial, and orchestrates the balloon's escape.
XVI
Remains calm and decisive during the storm, managing the balloon's ascent and ensuring the safety of his companions.
XVII
Examines the balloon thoroughly, sets notes in order, sketches the landscape, and decides to descend and anchor.
Chapter XVIII
Identifies the river as the Nile, leads the descent to verify the discovery, and finds Debono's initials on Bengal Island.
XIX
Leads the discussion on geography and the sources of the Nile, referencing explorers like Debono and Lejean.
Chapter XX
Observes the landscape, explains the fig-palm and mammoth trees, and counsels against intervening in the battle.
XXI
Devises the rescue plan using ballast and electric light.
XXII
Directs the rescue using the electric light, cares for the missionary, and navigates the balloon over the volcano.
Chapter XXIII: The Goldmine and the Missionary's Burial
Calmly identifies the goldmine, philosophizes about the vanity of wealth, and decides to take bearings for future reference.
XXIV
Anxious and burdened by responsibility, he calculates the remaining water and gas, and openly discusses the peril with his companions.
XXV
Leads the expedition, remains calm and philosophical despite the dire situation.
Chapter XXVI
Experiences vertigo and despair during a night walk, but resolves to wait for wind; refuses Joe's plan to separate.
Chapter XXVII
The doctor remains composed, identifies the simoom as a means of escape, and shoots the lioness to save his companions.
An Evening of Delight
Philosophizes about human endurance, narrates the story of James Bruce, monitors the barometer for weather changes, and prepares for departure.
XXIX
Navigates the balloon, identifies the Benoué River, and links the explorations of Burton, Speke, and Barth.
Mosfeia and the Incendiary Pigeons
Remains vigilant and resourceful, guiding the balloon and explaining the history of explorers to his companions.
XXXI
Consults compass, notes favorable wind; discusses the lake's dimensions and the importance of staying together; tests the lake water and records results.
XXXII
Shows grave concern over the condor attack, orders defensive measures, and is deeply moved by Joe's sacrifice.
XXXIII
Leads the search for Joe, recalculates the balloon's equilibrium, and directs the exploration of Lake Tchad.
The Hurricane and the Resolution
Forced to abandon Joe due to the hurricane; resolves to return for him; shows despair but regains determination.
Chapter XXXV
Mentioned as Joe's master, who he believes is safe in the Victoria.
XXXVI
Calmly orchestrates the rescue, lowering the flame and directing Kennedy to drop ballast at the critical moment.
XXXVII
Monitors Joe's recovery, navigates the balloon, and decides to head toward Timbuktu.
XXXVIII
Prudently renews water supply, observes loss of gas in the Victoria, and recounts the history of Niger exploration.
XXXIX
Provides detailed commentary on the geography, history, and decline of Timbuktu; navigates the balloon using Barth's chart.
Chapter XL
Anxious about the southward drift and the balloon's condition; relieved when the wind shifts eastward.
The Approaches to Senegal
Decides to avoid landing in the dangerous Senegal region; orders the jettisoning of items to keep the balloon aloft; devises a plan to anchor in a forest for the night.
A Struggle of Generosity
Takes command, calculates the necessary sacrifices, and cuts the anchor rope to save the balloon from the fire.
XLIII
Leads the escape, devises the hot-air inflation plan, and remains calm under threat.
Conclusion
Arrives at the cataracts of Gouina, obtains official testimony, and later gives a recital at the Royal Geographical Society.
Endnotes
Referenced as the subject of the departure noted in the endnotes.
