A data set from Oehlert (2000) \emph{A First Course in Design and
Analysis of Experiments}, New York: W. H. Freeman.

Data originally from Cornell, J.~A. (1985).  ``Mixture experiments.''
In S.~Kotz and N.~Johnson (Eds.), {\em Encyclopedia of Statistical
Sciences}, Volume~5, pp.  569--579. New York: Wiley.

Columns are proportions of watermelon, pineapple, and orange 
juices, and appeal.