SYMMETRY IN TRANSPLANTED LIMBS 131 
15. Heteropleural, dorsodorsal 
Experiment S. E. 12. May 26, 1916. Left limb bud to right side, 
dorsodorsal orientation; mesoderm of host not injured at all. 
Ma3^ 27. Perfectly healed. 
May 30. Limb on operated side {TR) more massive than normal 
and points dorsally; on posterior border at base there is a small rounded 
prominence or bud (figs. 110 and 111, HOM, drawn May 31). 
June 4. Main limb (HET) is spindling and points laterally, though 
inclined slightly dorsally and posteriorh^; there are three imperfectly 
marked digits at the tip. From the bud at the posterior border there 
has developed a second limb (HOM) which has normal posture; it is 
of considerable size and shows beginning of digit ations (fig. 112, drawn 
June 5). 
June 7. The posterior member is much more massive than the 
other, which still sticks out to side and shows a very imperfect hand. 
June 19. The posterior member (HOM) is practically normal with 
four digits; it is mobile, though probably there is some extensor weak- 
ness of hand. The anterior member (HET), a left (not reversed), is 
thin and atrophic, the imperfect hand having three digits. It arises 
from near the shoulder of the other, the reduplicating plane being 
approximately radial (fig. 113, drawn June 12). 
Experiment S. E. 6. April 21, 1916. Right limb bud to left side, 
dorsodorsal orientation. 
April 22. Perfectly healed. 
April 26. On operated side there are two projections in limb region 
(fig. 109 A). 
May 2. Operated limb not quite so advanced as the normal; dis- 
tinct spur (fig. 109 B, S) on radial border, probabl}^ from the anterior 
of the two prominences. 
May 8. Specimen preserved (fig. 109). Operated limb (TR) not so 
advanced as normal, digits not so well developed. The spur (S) is 
attached to the antero-lateral border of arm above elbow and is as 
large as one of the primary digits. It is a radial reduplication which 
has remained abortive. 
16. Heteropleural, clorsoventral 
Experiment S. E. 11. May 26, 1916. Left limb bud to right side, 
dorsoventral orientation; mesoderm torn along posterior border of 
wound; no tissue lost. 
May 27. Perfectly healed. 
May 30. On side of operation a large limb bud points dorsopos- 
teriorly like the normal. Ventrally another distinct but smaller bud 
(DU) points ventroposteriorl}^ (figs. 114 and 115 drawn May 31). 
June 4. Operated limb (TR) longer and further advanced (digits) 
than normal (N). Otherwise no abnormality (fig. 116, drawn June 5). 
No trace of ventral bud noted last time. 
June 7. Limb on operated side still a little larger than the other. 
June 12. Still some difference in size (fig. 118) ; limb normal in form; 
motility not so good as normal, extensors of hand weak. 
