36 
BOTANY: HARRIS AND SINNOTT 
Proc. N. A. S. 
DIMEROUS SEEDLINGS 
TRIMEROUS SEEDLINGS 
HEMITRIMEROUS 
SEEDLINGS 
Me in 
S. D. 
c. v. 
Mean 
55. D. 
c. v. 
Mean 
S. D. 
c. v. 
Root poles 
Minimum 
A 01 
0 nei 
9 OQ 
K 00 
n a^a 
U.004t 
1 q no 
Maximum 
4 13 
0 338 
8 18 
0. J.O 
^ 1fi 
O. IO 
D 79Q 
u. 1 Ax) 
14 19 
Mean 
A ClK 
0 171 
1 in 
4. iy 
o.uy 
O 707 
U. 
1Q 07 
Primary double 
bundles 
Minimum 
a no 
O.'iO 
O.ol 
0 OQQ 
U.Zoo 
A QA 
K Ol 
D.Zl 
10.59 
Maximum 
4 ^9 
0 aaa 
14 74 
O.00 
0 ^81 
ID 01 
^ 7 A 
0 7p;o 
1 A 07 
Mean 
4 1Q 
±y 
n n 1 
Q AA 
y .00 
o.y 1 
n ADZ, 
A 87 
0.0/ 
K AQ 
n A7A 
u.o/o 
1 O Q*7 
Intercalary bundles 
Minimum 
n 07 
0 oai 
1U0. /y 
n no 
u.uy 
n oqo 
1 £A AO 
100. OZ 
r> oq 
f\ A A A 
U.449 
115.47 
Maximum 
0.83 
1.024 
355.48 
0.29 
0.686 
381.67 
0.53 
1.148 
214.68 
Mean 
0.49 
0.687 
182.70 
0.19 
0.491 
274.92 
0.44 
0.737 
163.82 
Mid-region of hypo- 
cotyl 
Minimum 
8.11 
0.409 
5.04 
11.99 
0.532 
4.42 
11.36 
1.169 
9.94 
Maximum 
10.62 
1.645 
17.34 
12.29 
1.283 
10.44 
12.32 
1.524 
12.87 
Mean 
9.23 
1.193 
12.67 
12.16 
0.883 
7.24 
11.94 
1.307 
10.96 
Mid-region of epi- 
cotyl 
Minimum 
12.11 
0.406 
3.35 
14.89 
1.152 
7.74 
12.93 
1.245 
9.07 
Maximum 
12.36 
0.757 
6.13 
16.10 
1.750 
10.87 
14.84 
1.778 
12.53 
Mean 
12.22 
0.586 
4.79 
15.47 
1.383 
8.92 
13.83 
1.560 
11.29 
The modal number of primary double bundles in the region of transition 
from root to stem structure at the base of the hypocotyl is four in the di- 
merous and six in the trimerous and hemitrimerous seedling. In the 
normal seedlings more than four bundles may occur, but in no case have 
fewer than this number been observed. In the trimerous seedling varia- 
tion both above and below the mode is found, the numbers ranging from 
four to eight. On the average the number is from 1.38 to 1.89 bundles 
higher (or from 30.5 to 47.0% higher) in the trimerous than in the 
dimerous seedlings. 
Intercalary bundles, which are rather uncommon in seedling anatomy 
in general, occur in from 11 to 46% of the normal seedlings, whereas they 
are found in only 9 to 29% of the trimerous and in 28 to 43% of hemi- 
trimerous seedlings. The average number of intercalary bundles is also 
generally higher in the dimerous plantlets. 
Considering the total bundle number at the base of the hypocotyl 
(primary bundles plus intercalary bundles) the trimerous and hemi- 
trimerous seedlings have from 0.77 to 1.91 bundles, or from 14.4 to 46.7%, 
more than the dimerous seedlings. The differentiation of the dimerous 
