Chapter 32 The Capital of Bornou.—The Islands of the Biddio-mahs.—The Condors.—The Doctor's Anxieties.—His Pre-cautions.—An Attack in Mid-air.—The Balloon Covering torn .—The Fall .—Sublime Self-Sacrifice. —The Northern Coast of the Lake. Since its arrival at Lake Tchad, the balloon had struck a cur-rent that edged it farther to the westward. A few clouds tempered the heat of the day, and, besides, a little air could be felt over this vast expanse of water; but about one o'clock, the Victoria, having slanted across this part of the lake, again ad-vanced over the land for a space of seven or eight miles. The