5.8 



THE HIGHER ANTHROPOIDS 



mental IVaturc is witnessed in the expansion of the eerebral hemispheres. The 

 fact that this system, which connects the cerebral cortex with the cortex of 

 the lateral lobes of the cerebelhim, should manifest itself onl\ m the mammal, 



FIG. 235. ORANG-OUTANG. LEVEL NEAR THE CAUDAL LLMITS OF THE PONS, 

 SHOWING THE EMERGENT FIBERS OF THE SIXTH NER\E. 



MCi>, Middle Cerebellar Peduncle; mf, Mesial Fillet; nau, Abducens Nucleus; nr. Nucleus ol Rolando; n6, 

 Abducens Nerve; N7, Facial Nerve; pn. Pontile Nuclei; pv. Pyramid; rst. Rubrospinal Tract; scp, Superior 

 Cerebellar Peduncle; so, Superior Olive; trp. Trapezoid Body; trd, Descending Trigeminal Tract; iv. 

 Fourth Ventricle; ver, Cerebellar Vermis. [Accession No. 199. Section 410. Actual Size 40 X 25 mm.] 



denotes the introduction into mammalian organization of a feature, which, it 

 not morphologicall}' new, is at least product ixc ol new attainments. As such 

 it calls for comparison with the mtramammalian species to determiiu' what 

 decisive physiological accession to vertebrate beha\ lor brought this imjjor- 

 tant svstem into existence. 



