[1]

1878 Smithia Pfundii

Sept 10th 10° 30' a.m. — marked rectangularly curved uppermost part of 3 stems, with dot below & above & then tied down stem, so that this part was nearly upside down., to see whether the curved part increase in curvature or straighten itself —

Sep 11th 10°. 30'. a.m Tallest plant shoot between black points nearly straight.— This indicates geotropism.— + Hyponasty ─ 2d tallest — somewhat straightened.

3d shortest hardly at all— probably growing slowly

Sept 12th Tallest, the black points which were on convex side now on concave — terminal portion of shoot at right angles to next succeeding portion, so in normal position, but rather more curved, as was seen by long shoot & turning it up. —I suppose due to epinasty.─ 2d Plant like no 1. but m black marks lateral. 3d shortest plant, with black points still on convex side & shoot

[in margin:] See sketch A

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more Hooked— Has not obeyed law

geotropism must act with exact force to keep terminal portion of shoot at right angles to lower, & after a time geotropism, changes into apogeotropism & shoot straightens itself— but apogeotropism will merely make the upside down shoot more curved or Hooked.