78 
ROSS G. HARRISON 
This group of experiments is interesting because two of the 
combinations (ventral half in place of dorsal and dorsal in place 
of ventral) are homogeneous. Out of thirteen such cases, normal 
limbs developed in eleven. 
For histories of representative cases see appendix (p. 136). 
128 ^HET 
HET HOM 
129 
130 
Figs. 128 and 129 Transplantation of half limb bud (comb. 11, fig. 120) ; dorsal 
half right to dorsal left (het.dd.). Exp. H. R. E. 5. HOM, homopleural member; 
HET, heteropleural member. 
Fig. 128 Outline of limb from above, ten days after operation (free-hand 
sketch). 
Fig. 129 Preserved specimen lateral view, nineteen days old. X 10. 
Fig. 130 Transplantation of half limb bud (comb. 9, fig. 120) ; anterior half 
left limb bud to posterior right (het.dd.). Exp. H. R. E. 11. Normal limb with 
small spur (S). X 10. 
22. Discussion of experiments with half buds. In order to es- 
tablish the conclusion stated in the introduction to this section, 
that it is the harmony or disharmony of the half-and-half combi- 
