56o THE HIGHER ANTHROPOIDS 



are not known to weep nor do they laugh in cjLiite the human sense of the 

 term, Init there is a certain resemblance to human hiugliter in the rhythmic 

 gasping and grunting when they are tickled. Probably this manifestation is 



FIG. 25 1 A. DORSAL SURFACE OF BRAIN, CHIMPANZEE. 

 lActual Length 06 mni.| 



physiological I \ closel\' akin to laughter. During the quiet contemplation ot 

 objects which si'imu to give them particular |)leasure, and the most conspic- 

 uous among such objects are little human children, the I'Utire face ol the 

 chimpanzee, especially the outer corru'rs of the mouth, has an expression 

 which is not altogether unlike a human smile. W hen perj^lexed, uncertain or 



