876 MAN 



The degree to whieh pithecanthrf)pus may have developed language can- 

 not be implied from anything in the external appearance of Wis brain. Doubt- 

 less his lingiiistie attaimnents were I'xtremely crude. On the other hand, the 

 fact tliat the cerebrum manifests such pronounced advances over the anthro- 

 poid brani \n an area so mtunatel\' idcntihed witli spi'cch m Ilomo sapiens 

 signilics the ch-crsivc step which pithecanthropus liad made m the de\elop- 

 meiit of Imman kind. 



W ith all due allowance for the reservations imposed I)y morpliological 

 limitations, the frontal lobe of the Javan man clearly indicates that the 

 brain had progressed in its psychic capacity, that it had expanded in those 

 portions upon which unide.xterity, reason, language and human personality 

 depend. 



THE PARIETAL LOBE OF PITHECANTHROPUS ERECTUS 



The parietal lobe of pithecanthropus also gives evidence of expansion, 

 although the details of this development are less conspicuous than in the 

 frontal area. It is impossible to discern the relief of any convolutions, and, 

 with the exception of the Sjdvian fissure, no critical impressions may be 

 detected. No discrete boundaries between the frontal and parietal or between 

 the occipital and parietal lobes may be distinguished. The hypothetical [)osi- 

 tion of the Rolandic lissure provides the anterior limits of the parietal area. 

 The increased ])r()minence of the parietal eminence, together with the general 

 widening of the cerebrum in this region, denotes a considerable extension of 

 the neopallium. As compared with the corresponding area in gorilla, this 

 expansion is emphatic. In contrast to the parietal lobe of Homo sapiens, it is 

 distinctly inferior. The j^arictal lobe as a whole represents the neopallial 

 area for the elaboration ol somesthetic sensibility. The expansion of this 

 area must be regarded as incidental not only to the augmentc"d inllux of 

 sensory impressions, but also to the increased complexity of their association. 



