120 ROSS G. HARRISON 
2. Homopleiiral, dorsoventral 
Experiment Tr. E. 219. May 17, 191G. Right limb Inicl to right 
flank, inverted. 
May 18. Heahng fair; a considerable area anterior to grafted bud 
not covered with ectoderm. 
May 21. Bud looks nearl.y normal, but points dorso-anteriorly. 
See sketches made on May 22 (figs. 10 and 11). 
May 25. Transplanted bud growing as rapidly as normal. The 
two point toward each other (figs. 12 and 13). 
May 29. Transplanted limb growing well; two distinct digits; 
points dorso-anteriorly and is apparently a mirror image of normal 
limb on same side (figs. 14 and 15). 
June 5. Rapid growth has continued; limb reaches gills; third 
digit well marked, fourth beginning to show, elbow bend is slight; 
hand in an almost vertical plane, palm being anteromedial. Limb is an 
undoubted left, i.e., reversed (figs. 16 and 17). 
Experiment Tr. E. 139. April 28, 1915. Right limb bud to right 
flank, inverted. 
April 29. Healing perfect, transplanted tissue rather prominent. 
Ma}^ 5. Limb bud points slightly dorso-anteriorl}-. 
May 8. Points distinctly dorso-anteriorly. 
May 17. Limb points laterally at angle of a little less than 60° to 
axis of body. Third digit developing. 
May 26. Four digits present (fig. 18). Limb does not look atro- 
phic, but gives no evidence of motility or sensitivity. Position as when 
last observed. Specimen preserved. 
Examination of serial sections shows that the anteromedial surface 
of the hand is the palm. There can be no doubt, consequently, that 
the limh is a normal left, having been reversed. 
Experiment Tr. E. 1/fi. April 28, 1915. Right limb bud to right 
flank, inverted. 
April 29. Healing of Avound good; slight areas still uncovered by 
ectoderm at ventral border of wound. 
May 5. Transplanted tissue growing; but points anterodorsally. 
May 11. Digit ations plain; limb points as before. 
May 17. Limb now points almost transversely, with ulnar digits 
on anterior border. 
May 26. Perfect limb with extensor surface of elbow and ulnar 
digits dorso-anterior. No motility (fig. 19). Sections of preserved 
specimen show that ventral surface is palm, and that there can be no 
question about its being a left liml). i.e., reversed. 
Experiment Tr. E. 220. May 17, 1916. Right Hmb bud to right 
flank inverted. 
May 18. Wound perfectly healed. 
May 21. Transplanted bud very prominent. Sticks out to side 
and slightly anteriorly. 
May 25. Transplanted limb points dorso-anteriorly and not much 
to side. A small reduplicating l3ud points ventroanteriorly from near 
base. 
