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Many long pins were next driven rather close together into the sand, so as
to form a crowd in front of the same two thin lateral branches; but these
easily wound their way through the crowd. A thick stolon was much delayed
in its passage; at one place it was forced to turn at right angles to its
former course; at another place it could not pass through the pins, and the
hinder part became bowed; it then curved upwards and passed through an
opening between the upper part of some pins which happened to diverge; it
then descended and finally emerged through the crowd. This stolon was
rendered permanently sinuous to a slight degree, and was thicker where
sinuous than elsewhere, apparently from its longitudinal growth having been
checked.
Cotyledon umbilicus (Crassulaceae).--A plant growing in a pan
[page 220]
of damp moss had emitted 2 stolons, 22 and 20 inches in length. One of
these was supported, so that a length of 4 ? inches projected in a straight
and horizontal line, and the movement of the apex was traced. The first dot
was made at 9.10 A.


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