SYMMETRY IN TRANSPLANTED LIMBS 127 
June 2. Limb thinner than normal and somewhat hmp. Bends 
backward at tip. Two digits only. 
June 4. Specimen preserved (fig. 64). The arm sticks out hori- 
zontally to side; elbow bends posteriorly; two digits in same hori- 
zontal plane with very faint indication of ulnar digits. Limb clearly 
a right (not reversed), though it is distinctly smaller than normal and 
is otherwise defective. 
Experiment R. E. 70. Maj^ 12, 1915. Operation: right limb bud to 
left side, dorsodorsal orientation. Pronephros left in. 
May 13. Still a crescentic area of uncovered yolk at ventral border 
of bud. 
May 15. Transplanted hnd more prominent than normal; indica- 
tions of pointing anteriorly (fig. 67, drawn May 17, at which time the 
posterior bud could just be made out). 
May 21. Points anterolaterally. Attached to base is an ahnost 
equallv large reduplicating bud, pointing posteriorly and normally 
located (fig. 68, drawn May 22). 
May 27. Both buds growing. The original (anterior) one is still 
a httle further advanced than the other. Figure 69, drawn May 28, 
shows beginning of digits. 
June 7. The original limb is still the larger one, the reduplicated 
one has two digits and trace of third. The complex has some motility. 
June 11. Specimen preserved (fig. 70). The arm is double from the 
elbow down; the posterior or reduplicating member is not so well 
developed as the other. The anterior member is a right (not reversed) 
while the other is mirrored in a radiodorsal plane and occupies a posi- 
tion approximately normal for the left limb. 
Experiment R. E. 133. May 25, 1916. Right limb bud to left side 
dorsodorsal orientation. Pronephros removed. 
May 26. Fairly well healed. Small uncovered area ventral to bud. 
May 29. Transplanted bud well developed, points dorsoanteriorly 
about 45°. It is in proper position and about same size as normal. 
June 2. Limb points dorso-anteriorly, but more sharply dorsall}^, 
extending into notch behind last gill. Two digits show distinctly as 
in normal limb. Reduplicating bud from posterior Ijorder of base has 
position of normal left. 
June 5. Original liml^ (fig. 75, PR) points dorsolaterally toward 
gills and looks nearly normal. Posterior (reduplicating) bud (P.DU) 
is rather short and arises further tailward than normal limb; digitations 
beginning. A third small limb (A.DU) anterior to the original, pro- 
jects dorsolaterally, parallel to it. 
June 7. Original limb a normal right (not reversed) having two 
long digits with trace of third and fourth. The posterior bud has 
grown considerably and is in normal position. Anterior bud shows 
. traces of digits. 
June 12. All three limits have grown and differentiated. Posterior 
has nodule for third digit and is a normal left (reversed) . It is mir- 
rored in a radiodorsal plane while the anterior, limb, which is more 
THE JOURNAL OF EXPERIMENTAL ZOULOGV, VOL. 32, NO. 1 
