SUMMARY OF STRUCTURES 



713 



Mensuration ol tlu' t-ntiic xcstilnilar area, including the nucleus of 

 ncittrs and \hv niulcus ol Schwalln' in tho <z;reat antliropoids, shows the same- 

 relation between tluin, the ehimpanzec having a slight advantage over both 

 ol the others, w hile the orang shows a eonsiderabic inferiorit\' in tliis develop- 

 rnt[it. I he eoellieK'nts of Deiters' nueleus and of the vestibular area in orang- 

 outang, ehinipanzee and gorilla are gi\i'n in the following tabulation: 

 Coefficients of Di iieks' Area in the IIighfk Antiikoi'Oids 



Coefficients of VESTiiseLAK Area in the Highek Anthropoids 



COMPARISON OF THE \ESTiBL LAK NLCLEI OF THE GREAT ANTHROPOIDS AND 



THE intlk\h;diate 1>RIMATES 

 Tht' comparison of this portion of the neural organization in the great 

 anthro|)oids and the interniediate primates shows that they are all about on 

 the same plane of fli\ tlopnunt. Tlu' balancing nuehanism in the gibbon has 

 tlu' highest \alue of an\ member of these groups. This applies both to the 

 size of Deiters' nucleus and the \estibular elements in aggregate. The reason 

 for the gibbon's suj)eriority is ob\ ious. Its remarkable adaptation to arboreal 

 life shows to what degree this animal must depend upon a highly organized 

 ecpiilibratory mechanism. When the contrast is made with the lower iorms, 

 the great anthropoids appear to be about on a par with these distantly related 



