THE PAMPEAN PLAIN. THE RIO BAMBA (iX THE SOUTH OF THE 

 CORDOBA PROVIN'CE, 50O FEET ABOVE SEA-LEVEL). 



Small circular lagoons. The underground Water, which comes from the Sierras to the north- 

 west, here reaches the surface. Zone of lucerne farms. Photograph by the Author. 



THE PAMPEAX PLAIN. BUENA ESPERAXZA (SAX LUIS PROVINCE, 

 1,166 FEET ELEVATIOX). 



The plain is sown with quick and dead dunes, often shaped in a circle round a lagccn. A dune 

 invaded by vegetation. Photograph by the Author. 



Plate XVI. 



Tu face p. 182. 



