«54 
Vol. XXI, No. ii 
Journal of Agricultural Research 
and indicate that there is a tendency in the population as a whole to 
produce more than the mean quantity of wood. This tendency in the 
growth response may, however, be opposed by some factor in the tree 
which operates to cut down the number of individuals attaining greater 
length. 
Table II .—Mean length of laterals on unpruned mother shoots 
On mother shoots which had— 
Lateral No. 
i2 to 19 buds. 
20 to 27 buds. 
28 to 36 buds. 
Apical. 
Cm. 
•70 7 
Cm. 
66. 1 
Cm. 
66.3 
28. O 
27 -3 
6.9 
I*. 
l^' s 
18.8 
18.7 
6.9 
4. 5 
II.. 
v- 1 
Ill. 
IV... 
4. y 
V. 
4.4 
2.8 
VI. 
4* u 
S' 4 
VII. 
S' u 
1. 8 
T fl 
x. 4 
I * 3 
VIII. 
j. 7 
IX.. 
a. y 
7 f> 
• y 
4 . O 
X....;. 
S' y 
7 7 
0 
3 
XI.. 
S' / 
1.8 
5 
1. 4 
XII... 
7 
7 
7-3 
XIII... 
A. 4 
5 
XIV.... 
* / 
6 
S' 4 
1.8 
.8 
1. 4 
XV. 
6 
3 - 7 
T 6 
XVI. 
XVII. 
1. 9 
XVIII. 
*• 3 
XIX. 
2. 4 
XX. 
* 7 
r* 
2. 9 
XXI. 
• 5 
I. 4 
XXII... 
• 0 
• 7 
XXIII. 
• 4 
• 7 
XXIV. 
1.4 
XXV. 
XXVI. 
• 4 
XXVII. 
• 4 
XXVIII. 
• 3 
XXIX. 
XXX. 
XXXI. 
XXXII. 
XXXIII. 
XXXIV. 
XXXV. 
XXXVI. 
Total. 
134-1 
172.5 
To attempt any far-reaching analysis of the causes of the greater 
range and variability in the shoot production on the pruned trees would 
be unprofitable with nothing more than the data at hand. There is 
evidence that the orientation of a shoot with respect to a perpendicular 
line has a controlling influence per se upon the amount and distribution 
of subsequent growth. In selecting the material for this study the at- 
