526 



THE TROPICAL WORLD. 



enormous forest lands and river basins have never yet been visited by a naturalist, 



that the vegetation of the greater part of Central Africa is still completely hidden in 



'- ; : vA\r.^,~';;;-". W 



FOREST ON THE PANAMA RAILROAD. 



mystery, that no botanist has ever yet penetrated into the interior of Madagascar, 

 Borneo, New Guinea, South-western China, and Ultra-Gangetic India, and that, 



