Fig. 2. — Chimpanzee 6. A, left hemisphere ; the stippled area enclosed by the dotted lines together 

 with the parts of the adjacent sulci exhibit the portion of cortex ablated (see ablation ex- 

 periment 3, p. 194). The numerals inserted in the ablated area indicate the responses 

 obtained before ablation, also numerals 262 and 281. The bracketed numerals (343) indicate 

 the responses obtained from the same points at the final experiment. B, right hemisphere 

 of same animal reversed for comparison with left hemisphere. 



Fig. 3. — Left heniis])heres of two very young chimj)anzees 7 and 15, the figure B from the 



younger of the two, a baby. 



