The
control specimens exhibited no such irregular growth, and the two sets
presented a striking contrast. Out of the 8 radicles which had been touched
with caustic, two alone were not affected, and the marks left on their tips
by the caustic were extremely minute. These marks in all cases were oval or
elongated; they were measured in three instances, and found to be of nearly
the same size, viz. 2/3 of a mm. in length. Bearing this fact in mind, it
should be observed that the length of the curved part of the radicle, which
had become deflected from the cauterised side in the course of 8 h. 40 m.
was found to be in three cases 6, 7, and 9 mm.
Cucurbita ovifera: Sensitiveness of the apex of the Radicle.--The tips
proved ill-fitted for the attachment of cards, as they are extremely fine
and flexible. Moreover, owing to the hypocotyls being soon developed and
becoming arched, the whole radicle is quickly displaced and confusion is
thus caused. A large number of trials were made, but without any definite
result, excepting on two occasions, when out of 23 radicles 10 were
deflected from the attached squares
[page 170]
of card, and 13 were not acted on.
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