[came RON] 



THE HUMAN SKULL 



169 



impression. This brings out an important fact often lost sight of by 

 craniologists and it is this, that the growth of the brain must always be 

 considered along with that of the cranium; for the two go hand in 

 hand, and cannot be divorced from one another. Thus the growth 

 and expansion of the skull, as recorded above, both tell us that the 

 frontal lobes of the brain are amongst the last parts of that organ to 

 complete their evolutionary history. 



It is evident, then, that even the races of modern hominidœ can 

 furnish us with useful information regarding the evolution of the 

 frontal cranial arc. One can go further and say that a comparative 

 study of the highest and lowest types of modern man yields more 



.(kfas" 



l-IG. 9. 



— -■/- 



-Is a comparative study of a Melanesian and a European frontal cranial arc. 

 It will be noted that the area included between the Melanesian chord and 

 arc is only about one half of that included between these in the European 

 specimen. This Fig. seems to suggest that the forcing outwards of the 

 frontal arc by the phylogenetic frontal lobes of the brain apparently begins 

 at the bregmatic end and descends in a sort of undulatory wave-like move- 

 ment towards the glabellar end which is last involved. 



valuable knowledge regarding the evolution of the cranial roof than 

 ihe Piltdown specimen, more particularly with reference to the main 

 direction in which the evolutionary paths of both the brain and skull 

 have chosen to go. A study of the bregmatic angle, the frontal, parietal 

 and occipital chords and arcs further proves to us that the evolution 



