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Abstract
The difference in mean fibre diameter between ‘fine’ and ‘coarse’ lines produced by classing the fleeces from a single flock varies with the average diameter of the flock. Among fine merino wools, these differences are of the order of 0.3 μm, and they increase to 1.6 μm among coarser merino types. The reason for this variation with mean clip diameter appears to be genetic and not nutritional. The results confirm the theoretical treatment presented in Part II of this series.