A data set from Oehlert (2000) \emph{A First Course in Design and Analysis of Experiments}, New York: W. H. Freeman. Data originally from Low, C.~K. and A.~R. {Bin Mohd. Ali} (1985). ``Experimental tapping of pine oleoresin.'' {\em The Malaysian Forester\/}~{\em 48}, 248--253. Columns are shape of hole (circular, diagonal, check, or rectangular), acid treatment (control or acid), and amount of resin collected (g).