In this issue, the quarterly figures for exports and imports of primary producing countries given in the Statistical Appendix (tables 24 and 25) are seasonally adjusted. Table 1 shows the seasonal corrections applied, and gives some measure of their reliability. Seasonal adjustments were also calculated for a number of series not given in the Economic Review—notably for some primary producing countries' exports of certain commodities, such as cocoa and wool (table 1, part II). Chart 1 shows the adjusted and unadjusted lines for the total exports of the overseas sterling area, and also for some of the other series where the seasonal fluctuations are most marked.