A data set from Oehlert (2000) \emph{A First Course in Design and Analysis of Experiments}, New York: W. H. Freeman. Data originally from Draper, N.~R., S.~M. Lewis, P.~W.~M. John, P.~Prescott, A.~M. Dean, and M.~G. Tuck (1993). ``Mixture designs for four components in orthogonal blocks.'' {\em Technometrics\/} 35, 268--276. Columns are day, proportions of flours 1 through 4, and volume.