His house was generally of mud and wattles, but there are some examples of stone-built houses on a rectangular plan. In Thessaly, where Neolithic culture survived right through the flourishing periods of art in Crete and Mycenæ, they have even found Neolithic houses with three rooms and the sockets for wooden pillars. Caves were still used as dwellings, and there is also a round type of hut, derived, no doubt, from the still more primitive tent of skin and wickerwork. Of the religion of the Late Stone Age we know nothing, except that they buried their dead with care in tombs resembling their [Illustration: PLATE IV.--ASSYRIAN RELIEF: KING ASSUR-NASIR-PAL (9TH CENTURY B.C.) _Mansell & Co._] dwelling-places. Archæology has a rough method of assigning dates by allowing about a thousand years for every three feet of deposited earth; on this reckoning we may date the Neolithic period in Crete anywhere before 4000 B.C. Then gradually comes the beginning of the Bronze Age. All civilisation may be regarded as a progress in tools and weapons. Nowhere is the history of Europe traced with a clearer pen than in its armouries. As the guns of Crécy foretold the passing of chivalry, so the discovery of that alloy of copper and tin, which produced a metal soft enough to mould and hard enough to work with, meant a step forward for civilisation. At first, of course, bronze is rare and costly; it is confined to short dagger-blades and spear-points. Along with the earliest bronze we find an advance in the pottery, paint used to trace the patterns, though the designs are still those of dot and line; experiments are being made with colours and glazes. In experiment is the germ of progress; the conventional artists of the East imitate and sometimes improve their models, but they seldom make experiments. In Assyria and Egypt they have produced wonderful and beautiful works of art.[4] But with them art is ornament; there is no ideal, no striving to get nearer to the truth of things. The Oriental sculptor soon loses touch with Nature, and as his technique advances learns only the language of convention.