So long as such specimens were supposed to be of very rare occurrence, and differing as they do from the character of all other known minerals, it was not extraordinary that they should have been ascribed to an extraneous origin; but now that further discoveries have proved their existence in all parts of the world, and that enormous masses of similar iron have been met with in the northern parts of America, in Mexico, Columbia, Peru, Brazil,[61] and the provinces of La Plata, to speak of that continent alone, I think we may begin to doubt whether they may not be _bonâ fide_ productions of our own planet, instead of bringing them from the moon, or elsewhere. On this I shall only quote another passage from the letters of my excellent correspondent, who took the trouble to institute the inquiries for me as to the origin of the specimens from Atacama. "Time," he says, "may perhaps justify the tradition or opinion of the Indians relative to the origin of this iron; nor do I know why we should refuse to Nature the power of reducing in her laboratory a metal so easily separated from its combinations by the efforts of man." PROVINCE OF TUCUMAN. Forty leagues (post distance) beyond Santiago del Estero is situated the city of San Miguel de Tucuman. It stands (in lat. 27° 10´) on an elevated plain in a position from which the prospect on every side is delightful; indeed all accounts agree in describing it as the best situated town in the republic. The climate, though hot, is dry and salubrious; and Nature has been so prodigal of her choicest gifts, that the province of Tucuman well merits its appellation of the garden of the United Provinces. The population amounts to about 40,000 souls, of which 7000 or 8000 reside in the city.