By the useful process of generalization we may collect the following important results concerning our monuments: 1. They are scattered all over Amer. from lat. 45d. N. to 45d. S. of the Equator, thus occupying 90d. of latitude, which is no where else the case.--2. They chiefly occupy a flexuose belt from our great Lakes to Mexico, Guatemala, Panama, Quito, Peru and Chili.--3. There are few or none in Boreal America, the Eastern Shores of it as far as Virginia, the Western as far as California, nor in the Antilles, Guyana, Orinoco, Maragnon, Brazil, Paraguay and Patagonia; although some of these regions not having yet been properly explored may hereafter offer some likewise.--4. Those known from our Eastern Shores, the Antilles and Brazil are few, and of a peculiar character, distinct from the general style of the others. In New Hampshire concentric castramations have been found as in Peru, but not of stone nor shaped like stars. In Massachusetts inscribed rocks are met with, those of Pennsylvania East of the mountains are rude and small, and such they are as far as Virginia and Carolina. In the Antilles or West Indies, they are chiefly caves, temples and tombs. In Brazil we know of but few, but they are of stone and peculiar style.--5. Therefore the main monuments and structures occupy only one half of America or even less, they are mostly thickly scattered in the fertile regions near rivers, from Ohio to Florida, from Missouri to Texas, from Sonora to Honduras, from Bogota to Chili, &c. being often on high grounds and mountains, table lands and valleys, seldom in the low plains. Such are the most interesting by number and extensive spreading locations. Yet there are among them various ages and styles, the Floridan or North American, the Mexican or Anahuac, the Guatimalan or Tulan, the Peruvian or Inca--Series, are all somewhat different, mingled with others of earlier or various ages--in Peru the _Pucaras_ or oldest fortified cities in a stellate form are of earliest ages, the ruins of Tiahuanaco with sculptures of a remote period, the ruins of Chimu of another style yet, all different from the style of the Incas. In central America, the Cave-temples--the fortified cities and Palaces--and the _Teocalis_ or Pyramids and Towers, offer as many eras and styles. In North America we have also at least three great Eras and styles of monuments, the first or most rude, somewhat similar to that of the Antilles; excavations, small houses &c. and this, although so rude, is found to have lasted till very lately, as our log-house style is lasting with us along with large stone buildings. 2. A primitive style using earth and wood or rough stones for large and fine structures, temples, _&_c. 3. The most refined employing cut stones and ornaments, &c., rare in the North, but becoming more common towards Mexico.