Still more conflict and confusion have resulted from attempts to divide the Stone Age into watertight compartments. In 1865 Sir John Lubbock proposed two divisions—the Paleolithic, or Old Stone Age—and the Neolithic, or New Stone Age.[13] The Paleolithic included objects found in caves and glacial gravels; the Neolithic, on the surface and in tombs. The first period ran from some vague beginning hundreds of thousands of years ago up to the advent of the Neolithic after the glaciers had melted. By definition, paleolithic man made chipped stone implements and no other kind. Neolithic man was supposed to be distinguished by the making of ground, or—as we usually say—polished, stone axes and of other tools shaped by rubbing instead of chipping; agriculture, pottery, and textiles came in as secondary traits. After a time, however, archaeologists found some disturbing discrepancies. Before neolithic man grew grain and wove textiles, someone of an earlier age seems to have been making axes from antlers, turning out new artifacts called microliths—tiny chips of flint which were set in a row along a wooden or bone handle to make a kind of saw or a sickle—and also producing a partially polished ax with a ground edge, and making crude pots. This was all very upsetting to the old scheme of dividing prehistory into the Paleolithic and the Neolithic. So science inserted the Mesolithic, or Middle Stone Age, between the two, in order to account for the appearance of the new tools. The trouble with the system that Lubbock launched is that man’s behavior toward stone is a very poor basis for classifying him in culture or time. For a while it fitted our knowledge of the prehistory of Europe. Now it is out of line on that continent, and completely askew so far as the rest of the world is concerned. The kind of stone available often determines whether a man will chip or grind it. When first discovered, South Sea Islanders were still polishing stone because they had no flint.[14] Some Australian natives make chipped stone tools while their neighbors, who control a supply of diorite, go in for polishing; yet none of these Blackfellows can be considered as anything but paleolithic. Like the Bronze Age, the Neolithic suffers from having shrunk in length. Rickard figures “that 700 years covers what was meant to be a major division of human chronology.”[15] To reach this figure he puts the end of the Paleolithic at 3000 B.C., which seems much too late, and the beginning of bronze at 2300. Even though we use the date of N. C. Nelson for the beginning of the Neolithic—5500 B.C.[16]—we have a New Stone Age of only 3,200 years. Gordon Childe goes so far as to declare that “there is no such thing as a neolithic civilization.”[17] Different people, living under different climates and on different soils, have developed different elements of the culture of the New Stone Age and combined them with elements of other cultures.