New inventions were brought into use. Among them was a comb which, according to shape, might be compared to the dung-fork of the American stables. Ornaments for the body, made of various materials were fashioned. Pottery was still in a rough state, though gradually improving. The loom was invented, and various kinds of cloth were manufactured. Also out of the fibrous plants cordage was made, which again was fashioned into nets for fishing. Many canoes at various places have been found, showing that they were not only used for fishing but also for carrying cargoes. Workshops were established, and there the stone implements were made and polished; one of these shops was at Pressigny. [Illustration: FIG. 16. DANISH AXE-HAMMER, DRILLED FOR HANDLE.] Some idea may be had of the vast number of stone implements which occur, when it is considered that in the Museum of Copenhagen there are about twelve thousand, consisting of flint axes, wedges, broad, narrow, and hollow chisels; poniards, lance-heads, arrow-heads, flint flakes, and half-moon-shaped implements. In other collections in Denmark there are twenty thousand implements. The museum at Stockholm contains about sixteen thousand, and the Royal Irish Academy owns seven hundred flint-flakes, five hundred and twelve celts, more than four hundred arrow-heads, fifty spear-heads, seventy-five scrapers, and numerous other objects of stone, such as sling-stones, hammers, whetstones, grain-crushers, etc.[75] Some of these implements, however, may belong to other epochs. War must have been carried on to a considerable extent, as fortified camps have been discovered in Belgium, at Furfooz, and other places. Their weapons were the axe, the arrow, the spear, and possibly the knife. These were wrought with great care. _Agriculture._--Man commenced to till the ground in this age, and thus laid the true foundation of civilization. He probably was forced to do it. The beasts of the forest were gradually decreasing. They had nourished him in the infancy of his mind, and now he should begin to look to the soil, and by the cultivation of its products he must sustain his life. His principal implement of agriculture must have been the sharpened stick, pointed with deer-horn. He cultivated the cereals, made his corn-mill, and stored the grain for winter use.