I will not attempt here to give a formal explanation of these inscriptions, but may we not regard the spot in which they are found as having served for a rendezvous for the ancient Borrinqueños where they performed their sacrifices or the ceremonies of their religion? On the other hand, the appearance of these inscriptions is very peculiar. One of them might be considered a representation of those little figurines and statuettes of stone found in Mexico, in Mixteca, and in the country to the south. In another a head is curiously decorated with a diadem of feathers, and apparently represents one presiding at a feast served in the small circular basin set before him. The most noticeable thing in this group of inscriptions is the frequency of the grinning faces in a circle, often alone, often accompanied by two others placed at the sides, which are universally met with in every inscription found in the Greater and Lesser Antilles. The same may be said of the human figure apparently swaddled in cloths like a very young infant, the head and body more or less decorated, which is also very frequently found. Following these petroglyphs of Islote, we present a list of others discovered at Puerto Rico, hastily describing them and giving a particular description only of those which are of the greatest interest. In the above-mentioned grotto of Cueva de los Archillas, near the village of Ciales, we observed the curious figures bearing traces of a crown and peculiar ear ornaments. In la Cueva de los Conejos, some distance from Arecibo, on the road from Utauado, we found a figure partly incised and partly painted in a dark red; it is very artistically fashioned, and represents the famous “guava,” the monster spider of the Greater Antilles, of which the natives have a great dread. It is probable that the ancient Borrinqueños also considered it with a certain awe, and we find images of the same animal in la Cueva del Templo on the coast of Haiti, at Santo Domingo. A solitary rock of a reddish color, in a field of the hacienda of Don Pedro Pavez at la Carolina, a short distance from the Rio Pedras, bears a series of grimacing faces in circles. On a granitic rock of large dimensions, superimposed on a heap of rocks of the same character, in the midst of a grove of Indian trees and at the entrance of the Cano del Indio into Rio la Ceiba, near Fajardo, on the east side, are found three swaddled human figures, the heads decorated with various ornaments. On a black rock in the Rio Arriba, one of the branches of the Rio de la Ceiba, is a petroglyph which presents but little that is of interest.