The population is estimated at eight millions; of these, five millions are contained in a comparatively small space, of which the capital is the centre. Four fifths of this number are Indian peasantry; the others, either of the pure Spanish race or mixed with the Indian. The whole Mexican territory is said to be a million and a half of square miles—the whole of the portion containing the five millions does not exceed three hundred thousand square miles. The two roads, as already mentioned, are from Saltillo and from Vera Cruz. Let us see what States and population General Taylor would have to pass through, and then we may form some idea of the kind of resistance he may meet, if any defence at all be attempted: _States._ _Chief Cities._ Zacatecas, 272,000 Zacatecas, 40,000 Guanawhato, 500,000 Guanawhato, 60,000 San Louis, 250,000 San Louis, 25,000 Queretaro, 200,000 Queretaro, 30,000 Guadelahara, 800,000 Guadelahara, 90,000 Mexico, 1,500,000 Mexico, 200,000 ────── 3,522,000 All the above States must be traversed or passed through—they must be occupied in such a manner as to keep open the line of march of the army. We must not think that our marches will be similar to an insurrectionary movement among themselves. A Mexican General, at the head of a column, approaches the city of Mexico, or Guadelahara, a _pronunciamento_ takes places among the soldiers and citizens, and they invite the insurgent army to enter as friends and countrymen. If we look for such _pronunciamentos_ in favor of an American invading army, especially of heretics, we will be disappointed. There was nothing of this at Monterey, and the further we penetrate to the interior, the less there will be, of this kind of fraternization.