122 
Bateson . — On the change of shape 
Impatiens Sultani . 
This plant gave different results from those above detailed. 
Its pith continued to expand transversely in water without 
afterwards becoming narrower. Nine pieces of pith were 
measured and none of these showed the final contraction 
characteristic of Elder and Sunflower and Rhubarb. One of 
these cubes behaved abnormally in contracting during the 
first half-hour it was in water, after which it expanded : all the 
other eight cubes expanded steadily during the whole time 
they were in water 1 . 
Two examples follow: — 
IMPATIENS SULTANI PITH. GAIN OR LOSS IN THICKNESS 
GIVEN IN HUNDREDTHS OF A MM. 
Experiment 8. 
June 2, 1887. 
Diameter = 4-8 1 mm. 
Experiment 9. 
May 31, 1887. 
Diameter = 7 mm. 
Time. 
Time. 
12.21 p.m. 
In air. 
10.16 a.m. 
In air. 
water added. 
.17 » 
— 2-0 
.22 „ 
+ 1*0 
.20 „ 
— 1-0 
•3i » 
+ 05 
— 0-5 
•33 *> 
+ 0.5 
.21 „ 
water added. 
•36 „ 
0*0 
.22 „ 
+ 0.5 
•37 » 
+ 1.0 
•23 „ 
+ 1-0 
.42 „ 
+ 1.0 
.24 > y 
+ 1.0 
2.50 „ 
+ 8-0 
•25 „ 
+ 0.5 
3- 2 9 » 
0-0 
.26 „ 
+ 0.5 
4.10 „ 
+ 0.5 
•53 „ 
+ 8-o 
n-3 „ 
+ 2-0 
.10 „ 
0-0 
•35 »> 
+ 2-0 
12.28 p.m. 
4 2-0 
2.29 „ 
+ 1.0 
Results : — Exp. 8. Transverse diameter increases by 0-125 mm. = about 2-6 
per cent. 
Exp. 9. Transverse diameter increases by 0185 mm. = about 2-6 
per cent. 
1 The cells which make up the pith are remarkable in having their transverse 
greater than the-ir longitudinal diameter. 
