It is said that the Spaniards acquired such ease in the slaying of Indians that they would crack a man's head merely to see if it would split easily or if their swords were keeping their edge, and that they varied their more direct and merciful slaughters by roasting one of the despised infidels occasionally. Slavery in damp mines, fevers in swamps, unaccustomed work, strain, anxiety, grief, insufficient food, lack of liberty, separation from friends and families, killed more than the sword. It was the same in all the conquered lands. In Hayti a million people were oppressed out of existence or slain outright in fifteen years, and but sixty-five thousand were left. In less than a century that island had not a single native. So in Porto Rico: not a man is to be found there to-day who is a pure-blooded aborigine. Even their relics and monuments, their traditions and history, were obliterated by their conquerors--the race that destroyed the libraries of the Moors and the picture records of the Aztecs. Few even of their burial places are known, although the Cave of the Dead, near Caguana, was so named because of the Indian skeletons found in it. Some of the tools and implements of stone found on the island are so strange that one cannot even guess their purpose. Of the heavy stone collars that have been preserved, a priest holds that they were placed about the necks of the dead, that the devil might not lift them out of their graves, but this sounds like an invention of the church, for there is no proof that a belief in the devil existed among these people. They had a god, as well as minor spirits, and sang hymns to them; they had some crafts and arts, for they made canoes, huts, chairs, nets, hammocks, pottery, weapons, and implements, and, although the fierce Caribs vexed them now and again, they were accounted as the gentlest and most advanced of the native people in the Antilles. Speaking of the hammock, that is one of their devices that the world has generally adopted, and the name is one of the few Indian words that have survived the Spanish oppressions, though there are many geographic titles. Other familiar survivals are the words hurricane, canoe, tobacco, potato, banana, and a few other botanical names.