While the creoles were thus firmly establishing themselves along the Lower Parana and in the Andean provinces, the Jesuits were converting the Indians in the east of Paraguay, and early in the seventeenth century these indefatigable missionaries had penetrated to the Upper Parana, crossed it, and were gathering the Indians by thousands into peaceful villages. ARGENTINA CHAPTER I THE ARGENTINE LAND South from where the great mass of the Bolivian Andes shoves a shoulder to the east, as if seeking to join the Brazilian mountain system, and from where a low ridge stretches out to form the watershed between the Madeira and the eastward-flowing affluents of the Paraguay, extends an immense flat plain. Two thousand miles from north to south, and nearly five hundred miles in breadth, hardly a hillock rises above its surface from the foothills of the Andes westward to the sea. In the tropical North its surface is partly covered with trees, but south of the Chaco the only woodlands are narrow belts following the streams. Everywhere stretch the grassy plains, without an obstruction or interruption. The soil is a fine alluvium, full of the right chemical elements, and admirably adapted to agriculture, wherever the rainfall is sufficient. As a pasture-ground it is the finest on the planet. Within recent geological times this plain was the bottom of a great shallow gulf which received the detritus washed down from the Andes on the one side and the Brazilian mountains on the other. The gradual uplifting of those youngest mountains--the Andes--raised their flanks until the adjacent floor of the gulf appeared dry land, a land all ready and prepared for human occupancy. Nowhere does man encounter fewer obstacles to his freedom of movement or find it easier to procure his food supply than on the pampa--the characteristic topographical feature of the political division of South America known as Argentina.