72 
ROSS G. HARRISON 
limb buds, that a normal limb may arise from a disharmonic com- 
bination by the suppression of the original bud or by its reduction 
to a mere excrescence on the reduplicating member, which latter 
may develop into a normal limb. Eight of the ten normal cases 
which would otherwise appear anomalous may certainty be thus 
explained, and possibly the remaining two. It has been found 
TABLE 4 
Transplantation of half limb buds. Summary of results of actual experiments 
OPERATION 
RESULTING LIMB 
Num- 
ber 
Side of 
origin 
of 
graft 
Orien- 
tation 
Composition 
Direction 
of 
halving 
Designa- 
tion of 
trans- 
planted 
half 
Nor- 
ma! 
Nor- 
mal 
by re- 
sorp- 
tion 
Re- 
dupli- 
cated 
Abor- 
tive 
Dead 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
hom. 
horn. 
hom. 
hom. 
hom. 
hom. 
hom. 
hom. 
het. 
het. 
het. 
het. 
het. 
het. 
het. 
het. 
dd 
dd 
dd 
dd 
dv 
dv 
dv 
dv 
dd 
dd 
dd 
dd 
dv 
dv 
dv 
dv 
heterogen. 
heterogen. 
heterogen. 
heterogen. 
homogen.. 
homogen. 
homogen. 
homogen. 
homogen. 
homogen. 
heterogen. 
heterogen. 
heterogen. 
heterogen. 
homogen. 
homogen. 
vertical 
vertical 
horiz. 
horiz. 
vertical 
vertical 
horiz. 
horiz. 
vertical 
vertical 
horiz. 
horiz. 
vertical 
vertical 
. horiz. 
horiz. 
ant. 
post. 
dors. 
vent. 
ant. 
post. 
dors. 
vent. 
ant. 
post. 
dors. 
vent. 
ant. 
post. 
dors. 
vent. 
2 
2 
2 
2 




2 



4 
4 
5 
6 




2 

2 

2 
1 










2 
52 
2 
4 

31 
51 
4 
1 





n 




1 
3 







1 
1 


1 
2 


1 

1 
1 
1 
2 

1 
Total number of cases, 79; positive cases, 64 . . . . 
29 
7 ' 
28 
4 
11 
1 Includes one case of anomalous reduplication. 
2 Includes two cases of anomalous reduplication. 
also that almost any transplantation or even simple defect ex- 
periment may sometimes bring about reduplication. The three 
anomalous reduplications, being slight, are probably of this class. 
A further source of error might arise from the circumstance, that 
either the grafted or the stationary half may in certain cases be 
solely responsible for the limb that develops; for it is known, on 
the one hand, that any graft may be resorbed and, on the other, 
