Vöchting recognizes another sort of influence that determines the position of new organs on a piece. If a young, growing end of a stem of _Heterocentron diversifolium_ is suspended by two threads in a horizontal position, the ends bend upward as a result of the negative geotropism of the piece. The new roots appear at the base of the piece, _and also on the convex side of the bent part of the stem_, as shown in Fig. 34, _B_. The same result can be obtained by forcibly bending a twig, and then tying the ends together, so that it remains in its bent position. If a piece of this sort is suspended in a moist atmosphere, with the bent inner _concave side turned upward_, the roots appear on the base and at the bend, especially on the _under side_, both from the nodes and internodes. If now in order to see if gravity takes any part in the result the next piece is suspended with the outer _convex side_ of the bent part turned _upward_, it is found that many of the pieces produce roots only at the base, but others produce roots also at the bent portion of the stem, but they are fewer than in the last experiment. The roots arise for the most part on the _under side_ of the arch, and only a few arise from the upper part. It is clear that gravity is also one of the factors in the result. Leaf-buds arise in these pieces with the concave side turned _upward_ only near the apex; rarely one may develop on the lower part of the basal end. In pieces with the concave side turned _downward_ the leaf-buds arise for the most part at the apex, but sometimes they appear on the upper part of the basal arm. The results are due to two factors, gravity and an inner “force” that is supposed to be the resultant of a growth phenomenon taking place in the bent portion. Vöchting supposes that a process of growth takes place as a result of the bending; “the plasma streams to this region, and a new development takes place here more easily.” Vöchting adds that this view will not explain the morphological character of the new organs, and that this must be due to quite other causes. The results may, I venture to suggest, find a simpler explanation as the result of the bending, disturbing the tensions of the protoplasm, causing the two arms of the piece to act as if they had been separated from each other. This idea is more fully developed in a later chapter.