The attempt to determine what units of linear measurement were employed in ancient buildings is notoriously hazardous and full of pitfalls, yet when evidence unmistakably bearing on metrological questions does present itself it would be a cowardly procedure to suppress it merely for fear of "waking laughter in indolent reviewers." Some quarter of a century ago when studying the foot-length, or rather foot-lengths-for there proved to be two-in use at Olynthos in the fifth and fourth centuries B.c. I found that there were two reliable types of evidence: round numbers of feet in long dimensions-the city-blocks measured