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

Data originally from Westlake, W.~J. (1974).  ``The use of balanced
incomplete block designs in comparative bioavailability trials.''
{\em Biometrics\/}~{\em 30}, 319--327.

Lithium concentrations in blood 2 and 12 hours after dosing with
lithium carbonate. 12 subjects, each received 2 treatments (7 days apart).
Treatments are 300mg capsule, 250 mg capsule, 450 mg delayed-release
capsule, and 300 mg solution.  Respone in mEq/l.
Columns are treatment, period, subject, 2 and 12 hour responses