114 
OTIS F. CURTIS 
Table ii. Fagus grandifolia. April y to May 24. 
X. Check twigs not ringed. 
B. Ringed in the middle of the one-year-old wood. 
C, Ringed at the base of the one-year-old wood. " ^ 
T>. Ringed in the wood three to five years old which in all cases was under one centimeter in 
diameter. 
All having the same number were fairly well matched at the time of ringing. 
X 
B 
c 
D 
Length in 
Number of 
Length in 
Number of 
Length in 
Number of 
Length in 
NumbeF of 
Mm. 
Leaves 
Mm. 
Leaves. 
Mm. 
Leaves 
Mm. 
Leaves 
100 
5 
10 
20 
5 
30 
5 
2 
130 
5 
35 
J 
50 
5 
30 
4 
3 
9 
50 
5 
no 
7 
4 
170 
6 
10 
0 
17 
0 
60 
6 
5 
240 
8 
15 
0 
100 
6 
6 
7 
15 
0 
30 
0 
20 
4 
7 
6 
15 
2 
30 
3 
5 
Ave 
186.4 
6.6 
21.4 
2.1 
42.8 
3-3 
59-1 
5.0 
One of Hartig's chief arguments that carbohydrates move upward 
through the xylem was based on the fact that, if a tree was ringed, the starch 
Fig. 3. Fagus grandiflora ringed, while dormant, at different distances from the tip. The 
point of ringing is indicated by R. 
below the ring disappeared. He assumed that it moved upward, but there 
is no reason why it could not have been moved radially and used in cambial 
growth, or moved downward through the phloem to the growing roots. 
To test this latter possibihty, experiments were tried with Ostrya virginiana 
