DRY SCRUB OF THE CENTRAL CHACO. 



On the Anatuya line (province of Santiago del Estero). Cactus. The leafless tree in 

 the foreground is a red quebracho. The leafy trees are white quebrachos. 



Photograph by the Author. 



MARSHES (ESTEROS OR CANADAS) OF THE EASTERN CHACO. 



On the Tartagal line (province of Santa Fe). It is by means of these marshes, which 

 form in the forest, that this part of the plain is drained. Photograph by the Author. 

 PLATE V. To face p. 58. 



