Abstract
1. Variations among plants of the same variety in fertility, plant height and heading date were observed on different generations of five tetraploid varieties. In general, tetraploid plants showed a wider range of variation than diploid plants.
2. Having compared the variation among lines with that within lines (a line means plants raised from the seed of a plant of the preceding generation) by the analysis of variance, the variation among lines was in a greater part of cases found to be significant. In addition to this, significant correlations were found in some case between progeny and parent. Individual variation within a tetraploid variety seems, therefore, to be at least partly heritable.
3. However, on account of the variation arising continually in every generation, selection seemed ineffective, and the average of measurements for a number of plants was recognized to be a character peculiar to the given variety. Fertility seemed not to be improved with the lapse of generations.
