30 
ROSS G. HARRISON 
but few exceptions, were carried out under precautions necessary 
and sufficient to preclude contamination of this kind: the extir- 
pated area was three and a half somites in diameter, and the bed 
of the wound was carefully scraped after removal of the bud.^^ 
The results were somewhat different (proportionately) in the 
TABLE 2 
Orthotopic tran>< plantations . Summary of experiments 
OPERATION 
NUiMBER OF 
EXPERIMENTS 
SINGLE LIMBS 
NOT REVERSED 
SINGLE LIMBS 
REVERSED 
REDUPLICATED 
Total 
Posi- 
tive 
Num- 
ber 
Per 
cent 
Num- 
ber 
Per 
cent 
Num- 
ber 
Per 
cent 
A. Wound bed cleaned and wound' not less than 3| somites 
Horn, dd 
9 
61 
49 
26 
9 
38 
31 
16 
9 
10"- 
1 

100.0 
26.3 
3.2 
00.0 

1 
15 
00.0 
2.6 
16.1 
93.8 

271 
25 
1 
00 
Horn, dv 
71 1 
Het. dd 
SO 6 
Het. dv 
6 3 
Total 
145 
94 
20 
21.3 
21 
22.3 
53 
56 4 
Average of percentages . 
31.6 
28.8 
39.6 
B. Wound bed not cleaned 
Horn, dd . 
Horn, dv . 
Het. dd . 
ITet. dv . 
Total . 





37 
20 
194 
95.0 

00.0 
1 
17 
13 
2 
15.4 
3 
23.] 
8 
21 
15 

00.0 
8 
53.3 
7 
75 
48 
21 
43.8 
11 
22.9 
16 
5.0 
61.5 
46.7 
33.3 
1 Including three cases in which the primary bud righted itself by rotation and 
the duplicate is disharmonic. 
-Limbs which became normal by rotation, including one case (I. E. 101) of 
hyperdactyly. 
3 Normal by resorption of original member of pair. 
^ One case included in which the posture of the limb was abnormal. 
two classes of experiments and have been summarized separately 
in table 2 (A and B). The differences will be taken up in connec- 
tion with the consideration of each of the subgroups. 
7. Homopleural transplantations, dorsodorsal orientation. This 
is in reality merely a control experiment and is a test of the effect 
Harrison, '15 and '18, p. 422. 
