Prare IX 
Fig. 29 Cross-section of the spinal cord in Experiment 27 more highly magnified. v, ventral horn 
region on operated side. 
Fig. 30 Cross-section of the spinal cord nine days after the operation in a specimen developing 
parallel with Experiment 27. 
Fig. 31 Cross-section through the operated region two months after the removal of two somites in 
Rana pipiens. 
Fig. 32 Spinal cord of same embryo more highly magnified. 
