ways in which the Christian peoples measured the passage of time were based on calculations made before the fall of the Roman Empire. The Julian calendar of A.D. 325 was still in use in the age of Rabelais. The rise of statistics permitted the isolation of economics from the general social fabric of the sixteenth century: The Europeans were striving after a higher degree of quantitative accuracy in many domains during the span of the eighty years or so that followed. Some of them attached a novel importance to the amassing of statistics, and notable of statistics concerning rates of increase, as guides to economic policy, at the very period when, with Bodin, Malynes, Laffemas, Montchretien and Mun, economics first emerged as a separate subject of