From some time during the first inter-stadial of the last great glaciation (say some time after about 40,000 years ago), we have more accurate dates for the European-Mediterranean area and less accurate ones for the rest of the Old World. This is probably because the effects of the last glaciation have been studied in the European-Mediterranean area more than they have been elsewhere. A NEW TRADITION APPEARS Something new was probably beginning to happen in the European-Mediterranean area about 40,000 years ago, though all the rest of the Old World seems to have been going on as it had been. I can’t be sure of this because the information we are using as a basis for dates is very inaccurate for the areas outside of Europe and the Mediterranean. We can at least make a guess. In Egypt and north Africa, men were still using the old methods of making stone tools. This was especially true of flake tools of the Levalloisian type, save that they were growing smaller and smaller as time went on. But at the same time, a new tradition was becoming popular in westernmost Asia and in Europe. This was the blade-tool tradition. BLADE TOOLS A stone blade is really just a long parallel-sided flake, as the drawing shows. It has sharp cutting edges, and makes a very useful knife. The real trick is to be able to make one. It is almost impossible to make a blade out of any stone but flint or a natural volcanic glass called obsidian. And even if you have flint or obsidian, you first have to work up a special cone-shaped “blade-core,” from which to whack off blades. [Illustration: PLAIN BLADE] You whack with a hammer stone against a bone or antler punch which is directed at the proper place on the blade-core. The blade-core has to be well supported or gripped while this is going on. To get a good flint blade tool takes a great deal of know-how. Remember that a tradition in stone tools means no more than that some particular way of making the tools got started and lasted a long time. Men who made some tools in one tradition or set of habits would also make other tools for different purposes by means of another tradition or set of habits. It was even possible for the two sets of habits to become combined. THE EARLIEST BLADE TOOLS The oldest blade tools we have found were deep down in the layers of the Mount Carmel caves, in Tabun Eb and Ea. Similar tools have been found in equally early cave levels in Syria; their popularity there seems to fluctuate a bit. Some more or less parallel-sided flakes are known in the Levalloisian industry in France, but they are probably no earlier than Tabun E. The Tabun blades are part of a local late “Acheulean” industry, which is characterized by core-biface “hand axes,” but which has many flake tools as well. Professor F. E. Zeuner believes that this industry may be more than 120,000 years old; actually its date has not yet been fixed, but it is very old--older than the fossil finds of modern-like men in the same caves.