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

Data originally from Connor, W.~S. (1958).  ``Experiences with incomplete
block designs.''  In V.~Chew (Ed.), {\em Experimental Designs in Industry},
pp. 193--206. New York: Wiley.

Columns are farm, order (first, second, or third), weight (normal or heavy),
loft (normal or low), bottom bond (A or B), top bond (A or B), and filtration time.