[34]

Mar 1' 1880

Phaseolus multiflorus (Sachs' Curvature)

seeds in Clinostat Clinostat — radicles were acted on a little at first by geotropism from some unknown cause— now radicles well grown, & hypocotyl in every case parallel to long, axis of cotyledons & I do not think from cases of secondary epicotyl buds of Vicia faba, that skin of seed can account for parallelism of hypocotyl with the cotyledons.— What was more remarkable was that hypocotyl & radicle were in several cases (& in 1 or 2 cases where the primary geotropic action had not come into play) curved up to base of petioles laterally, as if the tendency to curve in the hypocotyl was so great, that it passed to one side of the cotyledons.─ ↘

[34v]

[sketch] like letter U U Epicotyl with Hooked tip

There is a 2d & better set of observations by Frank on first curvature. — Omit all about reversed curvature due to movement of epicotyl in straightening itself