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Rh also lie from south to north, and from north-east to south-west. The aborigines do not seem to have confined themselves to any precise rule in the erection of such monuments.

Peculiar care and industry have been bestowed on enclosing these elevations with large stones. Occasionally one descries above a hundred colossal blocks of stone, set round the foot of a hill in an elongated circle, and this too in districts where not only in the present day, but also without a doubt in ancient times, there was a deficiency of such stones. There are also traces in some instances of the hill having been originally surrounded with two or more large enclosures of stone.

The stone chambers erected on the summit of these mounds of earth are formed of a roofing or cap-stone which rests on several supporting stones placed in a circle.