[26]

Smithia Pfundii— two rectangularly bent shoots were turned upside almost upside down, so that concave side turned upwards, & this part straightened itself, considerably in a single day showing that the rectangularly bent position is chiefly due to geotropism acting in opposite direction, for if due to epinasty it wd have retained the same curvature with respect to the next succeeding portion of stem, which it had originally held. — I presume that the ultimate straightening of the curved portion under normal conditions is due to the apogeotropism.— With the stem turned upside down, this was not effected, as to do so the stem wd have been most abruptly curved, but this part slowly became much more curved, upwards with tip directed upwards