126 ROSS G. HARRISON 
April 16. Bud points dorso-anteriorly ca. 6Q° to horizontal; attach- 
ment slightl}' posterior to normal. Distinct prone]:)hric swelling ven- 
tral to limb. 
April 19. Oi-iginal l)iid points as before. Posterior reduplicating 
bud in approximately normal position. Anteriorly, at base of original 
bud, is a third bud pointing anterolaterally. 
April 24. Middle (primary) member points dorsally and has two 
long digits; anterior member is attached along anterior border of 
middle; posterior member, in normal posture shows beginning of digits. 
May 7. Specimen preserved (fig. 61). Posterior member, an 
essentially normal left limb from its origin above elbow down, has four 
digits; it is mirrored from the middle member in a radiodorsal plane. 
Anterior and middle limbs fused except for distal portion of manus; 
mirror plane, palmar. The middle member has two long digits and 
nodules on ulnar border, and is probably a right (reversed). Anterior 
member has three long digits and ulnar nodule, the third being partly 
fused with the second of the middle hand. Anterior hand possibly 
hyperdact^dous. 
" Experiment I. E. 86. April 10, 1917. Left limb bud to left side, 
rotated 180°— (fig. 60). Pronephros removed; pronephros transplanted 
with limb tissue. 
April 11. Well healed. 
April 14. Limb bud prominent, placed a little further posteriorly 
than normal; points slightly dorsall5^ 
April 16. Transplanted bud points dorsoposteriorly, but more 
dorsally and slightly more laterally than normal. Pronephric swelling 
ventroanterior to bud. 
Apiil 19. Limb points more doi-sally than normal. Small nodule 
at base is part of pronephros. 
April 24. Limb in normal posture not cjuite so long as- normal. 
Third digit beginning. Reduplicating digit conies off palmar side 
between first and second digits. 
April 29. Second and third digits reduj^licated (palmar) ; limb other- 
wise very nearty normal. JNIotility apparently not so good as normal. 
May 5. Limb clearly a left (not reversed) ; arm a little shorter and 
thicker. Motihty now better. 
May 7. Specimen preserved (fig. 62). 
9. Heteroploural, dorsodorsal 
Experiment R. E. 87. May 19. 19L5. Right limb to left side, dorso- 
dorsal orientation. Pronephros left intact. 
May 21. Small round uncovered area posterior to bud. 
May 25. Transplanted bud points anteriorly and laterally (ca. 4.5°). 
and is nearly as large as normal (fig. 63, drawn May 26). 
May 28. Limb points as before and is growing into gills, one of 
which is caught in notch between limb and neck and is l)ent ventrally. 
Limb itself bent slightl}^ at tip. Digitations faintly indicated. 
