SOUTH AMEEICA— THE ANDES REGIONS. 



more obstructed, the water-parting presents at various points certain tracts of 

 undecided slope, where the spring or swamp waters flow now in one direction, now 

 in another, according to the set of the winds, the abundance of local rains, 

 the alluvial deposits, or the effects of landslips. At the foot of the Bolivian 

 Andes the various branches of the IMamoré and Pilcomayo seem interlaced, 

 and lower down the level plains are dotted over with marshy tracts, whose 



Fig. 1. — Inhabitable Regions in Noeth Ameeica. 

 Scale 1 : 70,000,000. 



20' 



West or breenwich 



ME 



Arid deserts. 



Morasses. 



Glacial zones. Inhabitable lands. 



930 Miles. 



sluggish waters drain to both basins. In the heart of the continent the upper 

 affluents of the Guapore and the Jauru are merged together during the rainy 

 season. The Rio Alegre, a tributary of the Amazons, has its source on the 

 southern slope of the continent, and traverses a marshy parting-line before 

 sweeping round the Serra Agoapehy range of hills on its northern course to the 

 Guapore. Nothing would be easier than to establish a permanent connection 



