About a mile north-west are the quarries from which the great stones were obtained. The tomb was never finished. It fronted west. The north, east, and south arms of the cross do not vary in dimensions by the fraction of an inch. The length of each is 11.7 ft. and the width 5.2 ft., while the depth is 7.5 ft. There are three courses of huge stones, the largest measuring 12 ft. long by 3.3 ft. high and 3 ft. thick. Photographed by Saville ] [Illustration: GROUND PLAN OF CRUCIFORM TOMB, OAXACA] Sometimes a woman is assigned to a man who already has a wife, while some other man has none, because the group into which he is permitted to marry is exhausted. He then challenges the man who is entitled to more than one and endeavours to win the woman by success in battle. On one occasion in southern Nevada a white man’s sympathies were so aroused by one of these affairs, in which the girl was being roughly pulled about, that he threw off his coat and, taking an active part in the struggles, rescued her. Then he was amazed at the information that the girl belonged to him and he must keep her. This he declined to do and turned her over again to their tender mercies. These three forms of marriage become roundabout methods of personal choice. When the supply of wives is normal the young man in some tribes goes out into the woods by a certain trail, and if the girl of his choice follows him, it is considered a marriage, and is celebrated with prescribed ceremonies. Polygamy was practised by most tribes. Among the Navajos, who buy their wives, it is very common, but there a wife can depart at pleasure, and as the husband acquires no right to her property, she takes it with her.