The rise of statistics; The purpose of field trials; The idea of significance; The range of field trials; Characteristics of perennial plants; The place of statistics; Some simple designs; Complete randomization and the option of blocking; Randomized blocks; Latin square; The changing of treatments in a latin aquares; Factorial designs; Some more complicated designs; Non-orthogonal designs in general; Balanced incomplete blocks and other totally balanced designs; Some other kinds of balance; Calibration; The idea of calibration; Blocks, plots and replications; Trial design in relation to the subject of investigation; The analysis of results; Some mishaps and remedies; The measurement of perennial plants.