Dec. 13,1915 Translocation of Constituents of Seeds and Tubers 457 
Table IV .—Percentage distribution of the mineral constituents of corn seedlings 
Part. 
Phos¬ 
phorus as 
P2O5. 
Calcium 
oxid 
(CaO). 
Magne¬ 
sium oxid 
(MgO). 
Potas¬ 
sium as 
K2O. 
Silica 
(SiOa). 
Iron 
oxid 
(PesOs). 
Alumi¬ 
num oxid 
(AhO*). 
Leaves. 
26. 38 
30. 02 
28. 71 
35 - 74 
19.84 
2. 54 
3 - 44 
Exhausted cotyle¬ 
dons. 
43 * 24 
43. 86 
47.04 
20. 00 
S 8.66 
49-47 
4. 88 
Stems. 
17.44 
13. 21 
16. 82 
21. 17 
6. 41 
22. 62 
3.08 
Roots. 
12. 94 
12. 91 
7-43 
23. 09 
15-09 
* 5-37 
88. 60 
A comparison of these individual mineral constituents shows that 
except in the case of potash approximately 50 per cent thereof have 
been translocated from the cotyledons to the several parts of the seedling 
during growth, and that the translocation of potash is greatly in excess 
of that of the other mineral constituents. The taking up of such con¬ 
siderable amounts of iron and aluminum from the aluminum cups in 
which these seedlings had been grown and the great accumulation of 
aluminum on the roots of the seedlings is also a matter of interest, al¬ 
though it has no immediate bearing on the subject under consideration. 
It is also evident from the foregoing that there is a decided accumulation 
of translocated mineral matter in the leaves of the seedling, a fact that 
is in harmony with the rapid growth of the leaves as compared with that 
of the other parts of the seedling. 
EXPERIMENTS WITH POTATOES 
In the experiment with the potato tuber we have allowed potatoes to 
sprout in a dark closet, after they had been thoroughly cleaned. When 
the tubers began to soften they were removed from the dark closet and 
the sprouts (1) cut off. The potato was then carefully pared and the 
skin (2) and the starchy tissue (3) were carefully dried and ashed and 
the quantities of calcium, magnesium, phosphorus, potassium, and sili¬ 
con were determined. The results are shown in Table V. 
Table V .—Analysis of separate parts of sprouted potatoes 
Part. 
Part No. 
Total weight of air- 
dried material. 
i 
•5 
1 
1 
Ash in air-dried 
solids. 
$ 
I-S 
2 
l- 9 
1 
f k 
Calcium oxid (CaO) 
in ash. 
Magnesium oxid 
(MgO) in ash. 
Potassium as KiO 
in ash. 
Silica (Si Os) in ash. 
New sprouts. 
Sirin. 
1 
2 
3: 
Gm. 
31.3722 
46. 9359 
185.3766 
Gm. 
2.1185 
3- 8205 
8.X120 
Perct. 
9- 9i 
8.14 
4-37 
Gm. 
0.2661 
.2250 
1.0058 
Perct. 
12.56 
5-89 
12.40 
Gm. 
0.0190 
.0649 
.0608 
Perct. 
0.90 
1.70 
•75 
Gm. 
0.0443 
.0518 
• 1835 
Perct. 
2. 72 
1-33 
2.25 
Gm. 
0.8558 
1.5408 
4- 3415 
Perct. 
40.40 
40.33 
53-52 
Gm. 
0.0201 
.3228 
.0486 
Per 
ct. 
095 
8-45 
.60 
Tubers (ex¬ 
hausted) ... 
Total 
nriM /*rlt 
353.6847 
14.0510 
1.4969 
.1447 
.2796 
6. 7381 
*39i5 
.... 
WClgul. 
