SYMMETRY IN TRANSPLANTED LIMBS 67 
lo. Heteropleural transplantations, dorsodorsal orientation. In 
this group the results of five experiments all fall clearly within the 
same categor3^ A normal appendage in approximately normal 
position de\'eloped, and this had a reduplicating member attached 
to its radial border. The differences between the cases consist 
in the extent of reduplication and the degree of development 
attamed by the-disharmonic (anterior) member. The most extreme 
cases are one^^ in which the heteropleural member is reduced to a 
spur (fig. 109), and one^^ in which there is almost complete doub- 
ling from just below the shoulder down, the heteropleural member 
being, however, atrophic (figs. 110 to 113). Two of the three 
remaining cases^^ are very similar to one another, the anterior 
member with two digits arising from near the elbow. In the 
third individual the hand is reduplicated^^ externally, and the 
whole arm is somewhat shorter and thicker, indicating some 
degree of internal reduplication. 
16. Heteropleural transplantations, dorsoventral orientation. 
The five cases in this class all gave normal limbs (figs. 117 and 
118). Three of them showed slight indication of doubling (figs. 
114 and 115) in the early stages of development (four or five days 
after operation), but the more ventral-lying prominence had dis- 
appeared at the time of the next observation in each individual 
Figs. 110 to 113 Superposed limb bud; left to right side (het.dd.). Exp. 
S. E. 12. Reduplication. N, normal left limb; TR, operated limb; HET, hetero- 
pleural member; HOM, homopleural member. 
Fig. 110 Dorsal view, five days after operation. 
Fig. Ill Lateral view, same age. 
Fig. 112 Ventral view, ten days after operation. 
Fig. 113 Ventral view, seventeen days after operation. 
Figs. 114 to 119 Superposed limb bud; left to right side {het.dv.). Exp. 
S. E. 11. Operated limb {TR) of large size; A^, normal unoperated limb. X 10. 
Fig. 114 Dorsal view, five days after operation. 
Fig. 115 Lateral view, same age. A distinct nodule or bud {DU) on ventral 
border of limb was soon afterward resorbed. 
Fig. 116 Ventral view, ten days after operation. 
Fig. 117 Lateral view, same age. 
Fig. 118 Dorsal view, seventeen days after operation. 
Fig. 119 Lateral view of limb, same age. 
" S. E. 6. '4 S. E. 12. " S. E. 8 and 21. " s. E. 15. 
