Circles form another group of the monuments we are about to treat of, in this country more important than the dolmens to which the last section was devoted. In France, however, they are hardly known, though in Algeria they are very frequent. In Denmark and Sweden they are both numerous and important, but it is in the British Islands that circles attained their greatest development, and assumed the importance they maintain in all the works of our antiquaries which treat of megalithic art. The cognate examples in the microlithic styles afford us very little assistance in determining either the origin or use of this class of monument. It might, nay has been suggested, that the podium which surmounts such a tumulus, for instance, that of the Cocumella (woodcut No. 5) would, if the mound were removed, suggest, or be suggested, by the stone circles of our forefathers. This podium, however, seems always to have been a purely constructive expedient, without any mystic or religious significance, for unless the base of an earthen mound is confined by a revêtement of this sort it is apt to spread, and then the whole monument loses that definition which is requisite to dignity. The Rails of the Indian Buddhists at first sight seem to offer a more plausible suggestion of origin, but it is one on which it would be dangerous in the present state of our knowledge to rely too much; if for no other reason, for the one just given, that up to the time of Asoka, B.C. 250, they, like all the architecture of India, were in wood and wood only. Stone as a building material, either rude or hewn, was unknown in that country till apparently it was suggested to them by the Bactrian Greeks. Unless, therefore, we are prepared to admit that all our stone circles are subsequent, by a considerable interval of time, to the epoch of Asoka, they were not derived from India. My own impression is that all may ultimately prove to have been erected subsequently to the Christian Era, but till that is established we must look elsewhere than to India for our original form, and even then we have only got a possible analogy; and nothing approaching to a proof that any connexion existed between them.