398 BOTANICAL GAZETTE [JUNE 
The following is a typical table of the nutation during 
twenty-four hours. July 11-12, 1897; two days after rain; sun- 
shine and full moonlight throughout the period of observation ; 
moderate wind from the northeast. 
Time Temperature Angle of nutation Direction \ Remarks 
ig |e Peer ees Ce 35° West Sunshine 
6 p.m. 27 60 West Sunshine 
7 p.m. 24 75 West Sunshine 
Sunset 
8 p. m. 21 - go West Full moon 
9 p.m 19 70 West . Full moon 
Io p.m 19 40 West Full moon 
12m. 19 ° Vertical Full moon 
as 19 30 East Full moon 
Sunrise eA 
5 a.m. ‘16 55 East Sunshine 
6 a.m. 17 70 East Sunshine 
7 a.m. 18 70 East Sunshine 
19 40 East Sunshine 
IO a.m 21 20 East unshine 
12m. 22 fC) Vertical Fleeting clouds 
rl aes 23 15 West Fleeting clouds 
aes 23 20 West Fleeting clouds 
= Pm 22 40 West Fleeting clouds 
CO et 
There are thus four distinct periods in the daily nutation of 
the plant. 
1. From shortly after sunrise, when the plant is nutating 
about 60° east, until sunset there is a gradual movement west- 
ward until the terminal bud faces west and the upper part of the 
stem nutates go?. 
2. From sunset until about 10 o’clock p.M., durin 
time the plant regains its vertical position and the leaves drop 
downward so that their apices point vertically toward the earth. 
3. From 10 o’clock p.m. to I o’clock A.M., the period of 
repose. 
4. From 1 o’clock a.m. until sunrise, a gradual turning east 
ward, accompanied by a rising of the leaves by which they are 
g which 
