A data set from Oehlert (2000) \emph{A First Course in Design and Analysis of Experiments}, New York: W. H. Freeman. Data originally from John, P. W.~M. (1961). ``An application of a balanced incomplete block design.'' {\em Technometrics\/}~{\em 3}, 51--54. Test of 9 different detergents. There are three basins that are used simultaneously at the same rate with a different detergent in each basin. Response is number of plates until foam disappears in a basin. Column 1 is session. Column 2 is treatment (kind of detergen). Column 3 is response (number of dishes). Treatments 1-4 are detergent base 1 with (3, 2, 1, or 0) parts additive. Treatments 5-8 are detergent base 2 with (3, 2, 1, or 0) parts additive. Treatment 9 is a control.