CHAPTER FOURTH . African Explorations.--Barth, Richardson, Overweg, Werne, Brun-Rollet, Penney, Andrea, Debono, Miani, Guillaume Lejean, Brace, Krapf and Rebmann, Maizan, Roscher, Burton and Speke CHAPTER FIFTH . Kennedy's Dreams.--Articles and Pronouns in the Plural.--d**k's Insinuations. --A Promenade over the Map of Africa.--What is contained between two Points of the Compass.--Expeditions now on foot.--Speke and Grant.--Krapf, De Decken, and De Heuglin CHAPTER SIXTH . A Servant--match him!--He can see the Satellites of Jupiter.--d**k and Joe hard at it.--Doubt and Faith.--The Weighing Ceremony.--Joe and Wellington. --He gets a Half-crown CHAPTER SEVENTH . Geometrical Details.--Calculation of the Capacity of the Balloon.--The Double Receptacle.--The Covering.--The Car.--The M