60
M I C H A E L L O C K E
Adult
1
Fifth
D
D
10
9
8
7
6
5
4
3
2
1
Displaced
l3
t*
p
p
10
9
8
7
oxiolly
10
9
8
7
^
-3i
-31
4
10
9
8
7
6
5
4
3
2
I
FIG. 26. Grafts in Rhodnius which result in a distorted pattern. Grafts were performed on the fifth instar and the results observed in the adult. When a graft from
the front of a segment is transposed to the rear of a segment and vice versa, the
pattern of both host and graft is distorted as shown. The levels from the front to
the back of a segment have been assigned numerical values in the bottom diagram.
The arrows indicate the direction in which the host pattern would be expected to
be displaced, and the small figures show the difference in value between host and
graft. (After Locke, 1959a.)
pected, if the graft was not influenced by the host but determined from
within itself. We might expect that this would happen where the wound
region between host and graft had not healed before the determination of
the patterns had been completed (see also the results upon grafts in
appendages, Section II,B,3).
3. The Repeating Gradient as a Feature of Segmental Organization
In the experiments above, the abdominal segments used all had similar
patterns, but it seemed probable that the properties of the epidermis de-
M I C H A E L L O C K E
Adult
1
Fifth
D
D
10
9
8
7
6
5
4
3
2
1
Displaced
l3
t*
p
p
10
9
8
7
oxiolly
10
9
8
7
^
-3i
-31
4
10
9
8
7
6
5
4
3
2
I
FIG. 26. Grafts in Rhodnius which result in a distorted pattern. Grafts were performed on the fifth instar and the results observed in the adult. When a graft from
the front of a segment is transposed to the rear of a segment and vice versa, the
pattern of both host and graft is distorted as shown. The levels from the front to
the back of a segment have been assigned numerical values in the bottom diagram.
The arrows indicate the direction in which the host pattern would be expected to
be displaced, and the small figures show the difference in value between host and
graft. (After Locke, 1959a.)
pected, if the graft was not influenced by the host but determined from
within itself. We might expect that this would happen where the wound
region between host and graft had not healed before the determination of
the patterns had been completed (see also the results upon grafts in
appendages, Section II,B,3).
3. The Repeating Gradient as a Feature of Segmental Organization
In the experiments above, the abdominal segments used all had similar
patterns, but it seemed probable that the properties of the epidermis de-