136 ROSS G. HARRISON 
May 27. Anterior member has remained slender, and still has but 
two digits; distinct elbow bend; general shape indicates it to be a right. 
The posterior member, practically normal except slightl}' underdevel- 
oped, is an undoubted right; first two digits partly syndactylous (first 
short); third is distinct and fourth indicated. Some function in this 
member. 
May 28. Specimen preserved; form of limbs shown in figure 132. 
Sections show that there are two separate sockets in the shoulder-girdle 
for the two limbs. The medial surface of both is the palm. Hence 
both are rights. 
21. Heteropleural, dorsoventral 
Experiment H. R. E. 36. April 4, 1918. Ventral half left limb bud 
(inverted) in place of dorsal right (fig. 120, 16). Pronephros removed. 
April 5. Perfectly healed. 
April 8. Operated l^ud a little sharper; points normally (dorso- 
posteriorly). 
April 10. Nearly normal; points slightly more dorsally. 
April 13. Normal. 
April 16. Normal limb; digitations show. 
April 30. Specimen preserved (fig. 133). 
Experiment H. R. E. 10. April 11, 1917. Anterior half left limb 
bud (inverted) in place of anterior riglit (fig. 120, 13). Wound com- 
pletely healed same evening. 
April 14. Limb bud o])erated side nearly normal looking. 
April 16. Almost perfectly normal. 
April 18. Operated liml) normal except slightly larger. 
April 23. Reduplication of digits radial side. 
April 28. Operated limb a normal right with two digits arising from 
palmar surface near radial border; arm somewhat thicker than normal. 
May 7. Specimen preserved (fig. 134). The first digit is somewhat 
small; the reduplicating digits (DU) are united at base. 
