The lines traced were either nearly
straight or slightly zigzag; and in this latter case we see that a trace of
circumnutation was retained even under the influence of a moderately bright
light. Twice whilst these epicotyls were bending towards the window, dots
were made every 5 or 6 minutes, in order to detect any trace of lateral
movement, but there was hardly any; and the lines formed by their junction
were nearly straight, or only very slightly zigzag, as in the other parts
of the figures. After the epicotyls had bowed themselves to the full extent
towards the light, ellipses of considerable size were described in the
usual manner.
[page 429]
After having seen how the epicotyls moved towards a moderately bright
light, seedlings were placed at 7.48 A.M. (Sept. 7th) before a north-east
window, covered by a towel, and shortly afterwards by an ordinary linen
blind, but the epicotyls still moved towards the window. At 9.13 A.M. two
additional muslin blinds were suspended, so that the seedlings received
very little more light from the window than from the interior of the room.
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