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The geotropic presentation time was studied in Avena coleoptiles as a function of the distance from the tip. Curvatures of decapitated plants, allowed to curve in IAA‐solutions, were recorded. Extrapolated values of the presentation times are roughly the same (about 4 min) in coleoptiles from which 1, 3, or 5 mm, respectively, of the tip have been removed by decapitation. Presentation times reported in the literature are generally longer and are stated to increase considerably with the length of the portion of the tip removed by decapitation. No such relationship was found in the present study. The discrepancies can, at least to a large extent, be explained by differences in principles and methods of measurement. The present results are in accord with measurements on the geoelectric effect in coleoptiles.

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