characteristic of the elemental atoms, etc. The sample is not destroyed, but can be used again. Analysis of variance on the profiles of the sample jars found that minor variation of constructional features was random. On the other hand, there existed regional non-random profiles, which indicate regions of a single clay composition. The pots must have been manufactured there from them. A method had been found to identify at least by region the geological beds from which the clay had been retrieved. Regions of stirrup-jar manufacture The control sample regions were as follows. East Peloponnesus, represented by 5 jars from Mycenae and Berbati in the Argolid, LH III A2 and LH III B. Attica, represented by 4 jars, LH III C. Aegina, represented by one jar, LH III C. Rhodes, represented by 3 imports from East Peloponnesus, LH III A2 and LH III B, one from Attica, LH III B - C1, and 4 native to Ialysos, Rhodes, LH III C1. Crete, represented by 2 jars from Knossos, LM III B. Cyprus, represented by 4 imports from East Peloponnesus, LH III A2, LH III B, and 2 native Cypriote, 12th century BC. Caria, represented by 1 jar from Assarlik, LH III C. Egypt. None were manufactured, but there were 3 East Peloponnesian imports, LH III B. In the test sample, there were three jars from Tell es-Sa'idiyes, 12th century BC, and one 13th-century jar from East Peloponnesus. This is the first scientific data illuminating the difficult questions of who used the stirrup jars, when, who manufactured the stirrup jars, where, how they got from one place to another, and what conclusions might be drawn from their presence. Because the Jordanian stirrup jars were so late, the project confined itself to the relative time period, LH/LM III, long after the invention on Crete and introduction of the type to Greece. LH III included, however, the floruit of Mycenaean culture. Some hypotheses are evidently inconsistent, such as, stirrup jars were the monopoly of Crete and only arrived in Greece by importation from there, or that stirrup jars were moved from one area to another when they were carried there by Mycenaean Greeks. Instead, several regions of competition are defined, not necessarily as a political bloc, but as regions where the jars were manufactured locally from local clays and sold with their contents on the open market both locally and for export. There