under the Influence of Injuries. 5 1 5 
control-plants for the total period after injury. The difference 
between the increase of the injured and of the control-plants, 
however, does not indicate the actual acceleration or retarda- 
tion of growth if the several short periods show both 
acceleration and retardation. 
Table I. 
Growth of root after shoot was injured. 
Series I. j a . — Entire shoot removed. 
Zea Mais. ( b. — Control. 
Series II. 1 a . — Entire shoot removed. 
, Vida Faba. \ b. — Control. 
Series III. ( a . — Plumule removed. 
Vicia Faba. j b. — Control. 
Temperature, 2 2° (constant). 
Series. 
Average 
original 
length of 
root of 
twelve 
seedlings. 
Average 
original 
length of 
shoot of 
twelve 
seedlings. 
Average 
normal 
rate of 
growth 
of root. 
Average 
growth of 
root, 
xst period 
after 
injury. 
Average 
growth of 
root,. 
2nd period 
after 
injury. 
Average 
growth of 
root, 
3rd period 
< after 
injury. 
Average 
total 
growth of 
root 
after 
injury. 
P. 
24 hrs. 
24 hrs. 
48 hrs. 
48 hrs. 
1 20 hrs. 
I. 
a. 
21 mm. 
9.5 mm. 
38 mm. 
43 mm. 
83 mm. 
66 mm. 
192 mm. 
b. 
21 >> 
9 » 
39 » 
36 „ 
C\ 
00 
47 » 
151 » 
P. 
24 hrs. 
24 hrs. 
48 hrs. 
144 hrs. 
216 hrs. 
II. 
a. 
50 mm. 
14 mm. 
14 mm. 
21 mm. 
36 mm. 
124 mm. 
181 mm. 
b. 
5° » 
16 „ 
14 „ 
2 7 !> 
3d „ 
72 „ 
135 >* 
P. 
24 hrs. 
24 hrs. 
24 hrs. 
48 hrs. 
96 hrs. 
III. 
a. 
34 mm. 
33 mm - 
43 mm. 
42 mm. 
68 mm. 
153 mm. 
b. 
3 6 „ 
3 2 „ 
42 ,, 
00 
00 
69 „ 
T 49 » 
If we examine Table I, Series I and II, we shall find that 
the injury produced an acceleration in the growth of the root 
as a final result in both series. In Series I the acceleration 
began within twenty-four hours, and continued for five days. 
In Series II a retardation was observed during the first 
twenty-four hours, followed by a period of normal growth, 
