A data set from Oehlert (2000) \emph{A First Course in Design and Analysis of Experiments}, New York: W. H. Freeman. Data originally from Bin~Jantan, I., A.~S. Bin~Ahmad, and A.~R. Bin~Ahmad (1987). ``Tapping of oleo-resin from {\em \uppercase{d}ipterocarpus kerrii\/}.'' {\em The Malaysian Forester\/}~{\em 50}, 343--353. Columns are treatment (sulfuric acid at 0, 2.5, 5, 10, or 15, 25, and 50% strength), tree, and yield in grams.