SYMMETRY IN TRANSPLANTED LIMBS 
17 
1. Homopleur.al transplantations, normal or dorsodorsal orien- 
tation. Nineteen cases were operated upon in this way (table 1). 
In all of the cases where observations are recorded (thirteen in 
number), the linibs, in the course of their development, gave evi- 
dence of their original orientation, in that they pointed posteri- 
orly or dorsoposteriorly when they first began to grow out (fig. 
5). In the three cases that gave rise to single limbs they contin- 
Fig. 9 Heterotopic transplantation (horn. del.), showing twin limbs from 
implanted bud; PR, primary member; DU, reduplicating member. Exp. T: 
182. X 10. 
one 
Exp. Tr. E. 
ued their growth in this direction, developing almost exactly like 
the normal (figs. 6, 7, and 8). Likewise in the four cases that 
gave rise to double appendages, the transplanted buds first began 
to grow in a dorsoposterior direction, and only later did the re- 
duplicating buds appear on the anterior border of the original 
limb. The original bud developed in each case into a limb of 
the same side, and the reduplicating buds became limbs of oppo- 
site asymmetry (fig. 9). Histories of typical cases are given in 
the appendix (p. 119). 
