The great stones, it has been supposed, were originally monuments of illustrious men, or the memorials of considerable actions,--or they were landmarks for deciding the bounds of fixed property. In time the memory of the persons or facts which these stones were erected to perpetuate wore away; but the reverence which custom, and probably certain periodical ceremonies, had preserved for those places was not so soon obliterated. The monuments themselves then came to be venerated,--and not the less because the reason for venerating them was no longer known. The landmark was in those times held sacred on account of its great uses, and easily passed into an object of worship. Hence the god Terminus amongst the Romans. This religious observance towards rude stones is one of the most ancient and universal of all customs. Traces of it are to be found in almost all, and especially in these Northern nations; and to this day, in Lapland, where heathenism is not yet entirely extirpated, their chief divinity, which they call _Storjunkare,_ is nothing more than a rude stone.[12] Some writers among the moderns, because the Druids ordinarily made no use of images in their worship, have given into an opinion that their religion was founded on the unity of the Godhead. But this is no just consequence. The spirituality of the idea, admitting their idea to have been spiritual, does not infer the unity of the object. All the ancient authors who speak of this order agree, that, besides those great and more distinguishing objects of their worship already mentioned they had gods answerable to those adored by the Romans. And we know that the Northern nations, who overran the Roman Empire, had in fact a great plurality of gods, whose attributes, though not their names, bore a close analogy to the idols of the Southern world. The Druids performed the highest act of religion by sacrifice, agreeably to the custom of all other nations. They not only offered up beasts, but even human victims: a barbarity almost universal in the heathen world, but exercised more uniformly, and with circumstances of peculiar cruelty, amongst those nations where the religion of the Druids prevailed. They held that the life of a man was the only atonement for the life of a man. They frequently inclosed a number of wretches, some captives, some criminals, and, when these were wanting, even innocent victims, in a gigantic statue of wicker-work, to which they set fire, and invoked their deities amidst the horrid cries and shrieks of the sufferers, and the shouts of those who assisted at this tremendous rite.