_Explanation._—The heavy horizontal lines show the average price during a period of ten years, though in a few instances the period is longer. The diagonal lines show the extremes of fluctuation during the period which they cover. During the first two hundred and fifty years the coinage of England made the shilling in which prices were reckoned a much larger unit, practically three times as great as at present. The dots within circles indicate where the horizontal lines might have been had the unit been always the same. The same dots crossed cover a period of forty years in which prices are somewhat uncertain, from transition between the old standard and the new. The beginning of the nineteenth century shows a remarkable condition of the wheat market, due chiefly to the wars in which England was engaged, together with issues of paper money affecting the standard of value. The record is especially interesting from showing, first, the great fluctuations natural from unequal seasons; second, the gradual increase in cost of production under the law of diminishing returns; third, the effects of changes in money legislation; fourth, the effect of extra consumption in times of war; and fifth, the effects of the present world-wide commerce in overcoming the law of diminishing returns. A more complete record for the eighteenth century would add to the interest, if not to the effectiveness of the chart. _Relation to wages._—For convenience of comparison, the average price of wheat in France during periods of twenty-five years, as given by Schoenhof, is added by dotted horizontal lines. The double line across the chart indicates the range of average day’s wages of house mechanics in England, without indicating the extreme of fluctuations. It seems evident that wages and subsistence have something in common. CHART NO. 9 [Chart.] Chart IX. Prices of hogs and hams in Chicago, 1884-1907. Page 95. _Prices of live hogs and green hams in Chicago, 1884 to 1897_ _General description._—This chart exhibits the fluctuations in prices of live hogs and green hams as shown by reports of the Chicago Board of Trade from September, 1884, to August, 1897, together with the visible supply of live hogs in the market from month to month and for the entire year. The figures to right and left give dollars per cwt. of live hogs, and per barrel of green hams. The figures upon the upper third of the chart, right and left, indicate the number of thousands of live hogs received in Chicago during the successive months, as indicated by the dark lines. The figures at the top of the chart under the date line give the number of thousands of hogs received during the entire year. The year is taken from September to August following, because the hog crop is in large measure dependent upon the corn crop coming into use in September.