The contents of the tumuli differ also. Sometimes the bodies were burnt and the ashes preserved in rude urns; sometimes they were not cremated. Sometimes they were buried in stone cists, or in the hollowed trunk of trees; sometimes without any covering save that of the earth. In nearly all cases we find numerous articles buried with the dead, such as personal ornaments, weapons, pottery, and food. The presence of food in the tumuli testifies to the natural instinct implanted by the Creator in the human heart with regard to a future existence. The idea that the soul of the departed is about to take a long journey is constant and deeply rooted; the rainbow and the milky way have often been supposed to be the paths trod by the departed, who require sustenance for so long a journey. The Aztecs laid a water-bottle beside the bodies to be used on the way to Mictlan, the land of the dead. Bow and arrows, a pair of mocassins with a spare piece of deerskin to patch them if they wear out, and sinews of deer to sew on the patches with, together with a kettle and provisions, are still placed in the graves by the North American Indians. The Laplanders lay beside the corpse flint, steel, and tinder, to supply light for the dark journey. A coin was placed in the mouth of the dead by the Greeks to pay Charon, the ferryman of the Styx, and for a similar purpose in the hand of a deceased Irishman. The Greenlanders bury with a child a dog, for they say a dog will find his way anywhere. In the grave of the Viking warrior were buried his horn and armour in order that he might enter the halls of Valhalla fully equipped. These and many other examples might be quoted showing the universality of the belief in a future life, a belief that was evidently shared with other nations by the primeval races who inhabited our islands in prehistoric times. The presence of food and drinking vessels in the tumuli clearly shows this, and also the store of weapons and implements, adzes, hammers, scrapers, and other tools which the barrows have preserved through so many ages. These barrows are not confined to one period or one race, as their shape denotes. Some are long, measuring 200 to 400 feet in length by 60 or 80 feet wide; others are circular. The former were made by the long-headed (dolichocephalic) race of whom we have already spoken; the latter by the round-headed (brachycephalic), conquerors of their feebler long-skulled forerunners. When we consider the poor tools used by these primitive peoples, we may wonder at the amount of labour they must have expended on the construction of these giant mounds. Picks made of deer's horns and pointed staves enabled them to loosen the earth which was then collected in baskets and thrown on the rising heap. Countless toilers and many years must have been needed to produce such wonderful memorials of their industry. [Illustration: PLAN OF A TUMULUS]