124 ROSS G. HAERISON 
8. Homopleural, dorso ventral 
Experiment I. E. 6Jf. May 13, 1916. Left limb bud to left side, 
inverted. Pronephros removed. 
May 15. Small uncovered area ventral to bud, which is larger than 
normal and slightl,y posterior to it. 
May 18. Limb bud points dorso-anteriorly (fig. 35). 
May 24. Transplanted limb points anteriorly into gills. Slight 
trace of digits; no reduplicating bud (fig. 36, drawn one day earlier). 
May 28. Limb points anterolaterally below gills. 
May 29. Limb is undoubtedly a right (reversed) and is perfectly 
normal except as to posture. Ulnar digits appearing on the antero- 
dorsal border of hand (figs. 37 and 38). 
June 1. Transplanted limb sticks out more to side than before and 
can be brought back further toward normal position. Motility was 
first observed two days ago. 
June 4. Larva has grown rapidly. Transplanted limb functions 
well; elbow bends toward tail instead of head. Limb a perfect right 
(figs. 39 to 41, drawn one day later). 
Experiment I. E. 60. May 11, 1916. Left limb to left side, inverted. 
Pronephros removed. 
May 12. Well healed, normal-looking bud. 
Mav 15. Grafted bud points dorso-anteriorlv. 
May 16. Sketches (figs. 42 and 43). 
May 18. Beginning of bud like outgrowth (reduplication) pos- 
teriorly (fig. 44, pU). 
May 24. Main limb {PR) points more sharply to side and rather 
more dorsally than normal. Posterior (reduplicating) bud {DU) has 
grown considerably (figs. 45 and 46, drawn May 23). 
May 29. Specimen preserved. Limb double from lower part of 
fore arm. The primary member, which is anterolateral, is a right 
(reversed), while the other, produced from the posterior bud, is a left 
(revei'sed back). Former has short first digit and well-marked third. 
On the reduplicating hand a trace of third digit present (figs. 47 and 
48) . Mirror plane is radiodorsal. 
Frontal sections show the radii of the two arms are fused at the 
proximal end, the two ulnae being entirely separate. The humerus is 
single, i.e., fused throughout and is much more massive than normal. 
Glenoid cavity is also much larger, but normally oriented. Barring 
slight abnormalities, the shoulder-girdle seems to be a normal left 
(not reversed). 
Experiment I. E. 63. May 12, 1916. Left limb to left side, inverted. 
Pronephros removed. 
May 13. Fairly well healed. 
May 15. Transplanted bud smaller than normal; points dorsally, 
sharply laterally, and slightly anteriorly (figs. 49 and 50, drawn May 16). 
May 19. Points dorso-anteriorly. Slight indication of posterior 
reduplicating bud at base (figs. 51 and 52). 
