Burials in tree-coffins, of various periods, have been occasionally met with in grave-mounds, and a few words concerning them may here be introduced. One of the most interesting was found recently by that indefatigable antiquary, the Rev. Canon Greenwell, at Scale House, in Yorkshire.[15] The barrow was about thirty feet in diameter, and five feet in height, and was surrounded by a circle of soil at the base. It was entirely composed of soil, interspersed here and there with fragments of charcoal, firmly compacted. On the top, for a space of about six or seven feet in diameter, a covering of flattish stones was laid just below the surface. On digging down at this spot it was found that a hollow had been made in the natural surface, that had been filled up with soil, upon which had been placed a few stones and then a coffin, constructed of the trunk of a small oak tree. This primitive coffin was laid north and south, the thicker end, which no doubt contained the head of the corpse, towards the south; which was also the case in the Gristhorpe barrow. The oaken trunk, or tree-coffin, was seven feet three inches in length, and one foot eleven inches in diameter, at the spot in which it was measured. The Gristhorpe coffin “is seven feet and a half long, and three feet three inches broad.” Above the coffin the soil was finer, and upon this finer stratum was situated a layer of dark matter a good deal burned, and containing pieces of charcoal. Over the whole was a covering of the ordinary compacted soil of which the barrow was composed. The body inhumed in this tree-coffin, and not burned, had gone totally to decay, leaving only a whitish unctuous matter behind. This substance was no doubt _adipocire_, the production of which is to be accounted for by the extreme wetness of the barrow. Before interment the corpse had been clothed, or wrapped, _from head to foot_ in a woollen fabric,[16] a specimen of which is represented in the following figure:-- [Illustration: Fig. 31.] There were no flint chippings discovered in the soil of which the barrow was composed, or other object, and nothing else was contained in the tree-coffin, save the body in its wrappings. Some pieces of a bright black substance like pitch, which appeared to have been placed on the inside of the coffin, on examination are found to be composed of carbon and oxide of iron.