ILLUSTRATIONS 



PLATE 



I. THE FALLS OF THE YGUASSU . . . Frontispiece 



FACING PAGE 



II. THE ARID ANDES — 



PUNTA VACAS, ON THE TRANS-ANDEAN 



RAILWAY 22 



QUEBRADA DE IRUYA 22 



III. THE PATAGONIAN ANDES 38 



IV. VEGETATION OF THE INTERIOR VALLEYS (ANDES 



OF THE NORTH-WEST) 48 



FOREST ON THE OUTER SLOPE OF THE SUB-ANDEAN 



CHAINS . 48 



V. DRY SCRUB OF THE CENTRAL CHACO ... 58 

 MARSHES (ESTEROS OR CA5}aDAS) OF THE EAST- 

 ERN CHACO 58 



VI. THE VALLE OF SANTA MARIA, NORTH-WEST OF 



MOUNT ACONCAGUA 70 



THE OASIS OF ANDALGALA . ... JO 



VII. THE OASIS DEL RINCON, BELOW SAUJIL (ANDAL- 

 GALA LINE, PROVINCE OF CATAMARCA) . . 82 

 THE MONTE AT EL YESO ..... 82 



VIII. A VINEYARD AT SAN JUAN 92 



A VINEYARD AT MENDOZA 92 



IX. THE LAND OF THE BANADOS .... 100 



LORETO : FARMING BY INUNDATION . , . 100 



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