Sept, i, 1921 
Growth in Branches of Young Pear Trees 
853 
Tabus I .—Mean length of laterals on pruned mother shoots 
Lateral No. 
1.. .. 
11.. . 
111.. 
IV. . 
V. .. 
VI. . 
VII. 
VIII 
IX. . 
X. .. 
On mother shoots which, after pruning, had— 
4 to 6 
buds. 
Cm. 
126. 6 
73-6 
38-7 
6.6 
.8 
o 
XI . 
XII . 
XIII. ... 
XIV. . . . 
XV. 
XVI. ... 
XVII. . . 
XVIII. . 
XIX. . .. 
XX. 
XXI. ... 
XXII. . . 
XXIII. . 
XXIV. . 
XXV. . . 
XXVI. . 
XXVII. . 
XXVIII. 
XXIX. . 
XXX. . . 
XXXI. . 
XXXII. . 
XXXIII. 
XXXIV. 
XXXV.. 
XXXVI. 
XXXVII 
Total. . 
7 to 9 
buds. 
246. 3 
Cm. 
121 . 2 
71.4 
42. 2 
13.6 
17- 5 
i- 7 
i *7 
•03 
o 
269.3 
IO to 12 
buds. 
Cm. 
114. 5 
69. 6 
31.8 
9-7 
6. 7 
•5 
3.8 
2. 6 
. 2 
.8 
• 5 
o 
240. 7 
13 to 15 
buds. 
Cm. 
no. 2 
68.3 
33- 5 
14. 2 
6.9 
2. 1 
*•3 
2.8 
. 2 
2 -3 
1.9 
•7 
o 
o 
16 to 18 
buds. 
2 45-9 
Cm. 
no. 5 
60. 2 
29. 2 
i 3 - 1 
6. 2 
1.9 
4.6 
3- 1 
1.8 
• 5 
2. o 
1. 2 
•9 
.8 
. 2 
1.6 
o 
o 
19 to 21 
buds. 
Cm. 
103. 6 
70.9 
22. I 
9.9 
IO. I 
1. O 
i -5 
i -7 
2.8 
i -3 
2. 2 
2. o 
2. 7 
•3 
x -3 
1. 1 
i-3 
. 1 
i*3 
o 
o 
22 to 24 
buds. 
237-8 
237.2 
Cm. 
IOI. 4 
72. I 
2 9-3 
9-3 
8.4 
3-8 
6. 1 
•7 
•3 
i -7 
3- 7 
•4 
.8 
•7 
•3 
•3 
1.4 
1. 6 
3-4 
. 2 
. 2 
o 
o 
o 
25 to 27 
buds. 
246. I 
Cm. 
28 to 37 
buds. 
3L3- 1 
Cm. 
97.2 
73-3 
16.5 
•3 
13-4 
3-5 
2.4 
•3 
1. 1 
2. 
1. 
11. 
2. 
1. 
11. 
3 - 
7 - 
2. 
9 - 5 
•4 
7-4 
6.6 
•4 
2. 1 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
281.6 
These graphs give further evidence on the nature of the growth of 
new shoots on the pear tree. 
In case the total amount of growth produced on the mother shoots 
were dependent upon mere accidents of position or other factors of pure 
chance, we should expect to find that its frequency distribution would 
approximate the normal curve of errors. 
In both cases the frequency distributions depart rather widely from 
that of the normal curve of errors. The values for the growth on the 
pruned shoots were found to belong to Pearson’s type IV curve of frequency 
distribution in Rhind ( 12 ), and those of the unpruned shoots to a type I 
curve. Both distributions are distinctly skew toward the higher values 
O O C7\ M CCO Oj oo>© m3 C/1 
