Two poems are still preserved which contain ground-plans of the different compartments of the house, showing the position allotted to different ranks and occupations, and the special portion which was to be assigned to each. The numerous distinctions of rank, and the special honours paid to the learned, are subjects worthy of particular notice. The “saoi of literature” and the “royal chief” are classed in the same category, and were entitled to a primchrochait, or steak; nor was the Irish method of cooking barbarous, for we find express mention of a spit for roasting meat, and of the skill of an artificer who contrived a machine by which thirty spits could be turned at once.[176] The five great Celtic roads[177] have already been mentioned. Indistinct traces of them are still found at Tara. The Slighe Mor struck off from the Slope of the Chariots,[178] at the northern head of the hill, and joined the Eiscir Riada, or great Connaught road, from Dublin via Trim. Dr. Petrie concludes his Essay on Tara thus: “But though the houses were unquestionably of these materials [wood and clay, with the exception of the Tuatha De Danann Cathair], it must not be inferred that they were altogether of a barbarous structure. It is not probable that they were unlike or inferior to those of the ancient Germans, of which Tacitus speaks in terms of praise, and which he describes as being overlaid with an earth so pure and splendid, that they resembled painting.” And the historian Moore, writing on the same subject, observes: “That these structures were in wood is by no means conclusive either against the elegance of their structure, or the civilization, to a certain extent, of those who erected them. It was in wood that the graceful forms of Grecian architecture first unfolded their beauties; and there is reason to believe that, at the time when Xerxes invaded Greece, most of her temples were still of this perishable material.”