exhibited by Turgescent Pith in water . 1 19 
a slight diminution in thickness is generally noticed due to 
shrinking from loss of water by evaporation. When the water 
is added one of two things happens. 
(1) The transverse diameter begins at once to diminish. 
(2) Or the diameter at first increases and then diminishes. 
This dissimilarity in behaviour will be explained hereafter. 
In the following tables the Increase ( + ) and diminution ( — ) 
in the thickness of the pith are -expressed in hundredths of 
a millimeter. 
SUNFLOWER PITH, GAIN OR LOSS IN THICKNESS. 
Experiment 1. 
August 4, 1887. 
Diameter not measured- 
Experiment 2. 
August 4, 1887. 
Transverse diameter at end 
of experiment 5-27 mm. 
Experiment 3. 
August 3, 1887. 
Transverse diameter at end 
of experiment = 5-08 mm. 
Time. 
Time. 
Time. 
4.5 p.m. 
In air. 
11.48 a.m. 
In air. 
11.36 a.m. 
In air. 
•6 „ 
- 0-5 
water added. 
o-o 
water added. 
11.49 » 
0-0 
•37 „ 
- 0.5 
•7 » 
— i*0 
.50 „ 
— 2-© 
water added. 
.8 „ 
— 1-0 
— 1-0 
11.38.5 » 
+ 0.5 
•9 „ 
— 2.0 
•5 1 » 
- 2.5 
•39 » 
+ 1-0 
.12 „ 
- 2.5 
•52 „ 
— 2-© 
•40 » 
+ 3-° 
•13 „ 
+ 0.5 
•54 » 
- 3-5 
•4 1 » 
+ 1.5 
.16 „ 
-- o-5 
12.0 
+ 1-0 
•4 2 „ 
— I.Q 
12.6 ,p.m. 
0.0 
•44 
0-0 
•45 „ 
- 0-5 
•47 >, 
- 5-o 
| 
48 „ 
- i-5 
•48 >, 
- 0.5 
•49 » 
- 0-5 
•49 » 
— 1 0 
\ 
s5o w 
- 2-5 
•51 » 
- 1-5 
•53 „ 
- i-5 
— 1*0 
n-54 „ 
— 1-0 
.58 „ 
— 2-0 
•59 » 
0-0 
12.2 p.m. 
- 0.5 
•7 M 
- 0-5 
•9 „ 
0-0 
Results : — Exp. i. Transverse diameter diminishes by 0-065 mm. 
Exp. 2. Transverse diameter diminishes by o*io mm. — 1-9 per cent, of 
the diameter measured at the end of the experiment. 
Exp. 3. Transverse diameter increases by 0-06 mm. = 1.2 per cent., then 
diminishes by 0-205 mm. = about 4 per cent. 
•In Experiment 3 the .pith shows the preliminary thickening mentioned above. 
