Since the chapter, “Limitations of the Mathematical Method,” was written, it has been discovered that hog receipts at eleven markets are a more accurate indicator of hog prices than receipts at Chicago, and that prices of Connelsville coke are a better indicator of the demand for hogs than bank clearings outside New York City. The multiple coefficient of correlation between hog prices on the one hand and Chicago hog receipts and bank clearings outside New York City on the other hand is .65, whereas between hog prices and hog receipts at eleven markets and coke prices the multiple coefficient of correlation is .70. Footnote 10: This is the average as given in the Drovers’ Journal Year Books. It evidently is a weighted average based on varying receipts. Footnote 11: This is a simple average and not strictly comparable with the Chicago averages, which are weighted on the basis of varying receipts. Footnote 12: Interpolated from Kansas City market, on account of foot-and-mouth disease closing Chicago market. Footnote 13: Omaha prices, 1903 to 1907, inclusive; Chicago prices after 1907. Footnote 14: Prices for both wheat and corn are taken from the Year Books of the Rosario Board of Trade. Rosario is the Chicago of Argentina. The Argentine unit of weight, the quintal, is taken as equivalent to 3.67 bushels of wheat and 3.936 bushels of corn. The Argentine dollar is taken as equivalent to 42.6 cents. After July of 1918, prices are taken from the International Institute of Agriculture. Footnote 15: Flour exports converted into wheat at the rate of four and one-half bushels of wheat to a barrel. Footnote 16: These figures, previous to 1917, were taken from charts furnished by Dr. L. D. H. Weld, of Swift Company. Since 1917, the source has been the Daily Trade Bulletin of Howard Bartels. The top price for the month is used in every case. Footnote 17: These figures, previous to 1917, were taken from charts furnished by Dr. L. D. H. Weld, of Swift Company. Since 1917, the source has been the Daily Trade Bulletin of Howard Bartels. The top price for the month is used in every case. Footnote 18: The Milwaukee prices were compiled by Professor F. A. Pearson, of the University of Illinois, from the reports of the Western Feed Bureau. Footnote 19: