Newcomba, Sensitive Life of Asparagus plumosus. 
31 
the tip, tlie longest brauch being 3 cm. No secondary branches 
bad unfolded. The apex of the shoot at the time of covering was 
bent over into the horizontal plane and projected 3.5 cm laterally 
front the stäke about which the stem was twining. The first day 
after covering, the shoot made 1 complete turn; the second day, 1 more 
complete turn, and shortened the free tip to 2 cm beyond the stäke; the 
third day, 1 more complete turn, and shortened the free tip to 5 mm 
with a declension of 45°. The 4th day after covering, the shoot made 
half a turn and twined no more to the end of the experiment, 
6 days later. As in foriner experiments, so in this, the tip was 
several times brot back to the stäke so as to make it possible to 
twine if circumnutation was taking place. Observations at 15 
minute intervals for several hours in each of several days disclosed 
that, as twining ceased, circumnutation ceased. Nutation continued 
thruout the experiment, but the oscillations became smaller and 
smaller toward the end. The greatest divergence from the vertical 
on the second day before the last was 45°, and the declination 
during the first eight and one-half of the last 27 hours extended 
from 0° to 15°. During these eight and one-half hours, the tip 
became vertical 4 times. As in the preceding case, the turns of 
the spiral became steeper as the shoot neared the end of the 
twining. The turns of the spiral made in the light were 53 mm 
apart, on the 2 last days of twining 60 mm apart, and the last 
half turn made at the conclusion of twining stretched a vertical 
hight of 80 mm. (All these turns were made about the same stäke, 
the diameter being about the same thruout.) The total elongation 
after covering was 53 cm, of which 35 were made after twining 
ceased, and this section extended in a vertical line. 
It should be said that in the middle of the experiment when 
the shoot had reached the top of the stäke, a cord 2 mm diameter 
was tied to the stäke and fastened taut to a cross bar in the top 
of the cylinder, thus affording a means for the shoot to twine 
even if the possible circumnutation was in a very narrow Circuit, 
The absence of twining in these conditions, as well as my direct 
observations as before recorded, demonstrates that there was no 
circumnutation during the last 6 days. 
The regaining of the ability to twine after etiolation had 
caused its loss was followed in the shoots of the last 2 experiments. 
5) The covering c} T linders were removed at midday, and 
behavior followed in a few observations. Twenty-four hours after 
exposure to light, both shoots had taken on a pale green color in 
their apical 10 cm, and both tips were declined about 40° from 
the vertical, the bent portion having increased from 1.5 and 2 cm 
when the coverings were removed to 3.5 and 4 cm respectively. 
Forty-eight hours after exposure to light, the tips had still longer 
portions declining from the vertical. This increase in length of 
curved apex was the most noticeable change since uncovering. 
Ninety-six hours after uncovering, oue tip was declined 40°, and 
the other 70°, with the curved portions 5 cm and 8 cm long 
respectively. Both tips look as tho ready for twining, but both 
