372 



LECTURE XIII. 



tliougli the development of the supraciliaiy ridges^ and the 

 arching of the cranial roof, seemed to present at the first 

 glance great differences. 



With regard to the formation of the supraciliary ridges^ the 

 prominence of which, though not always, yet in this case de- 

 pends on the dimensions of the frontal sinuses ; there is no 

 doubt that they are also usually connected with the greater 

 development of the crests, ridges, and muscular force in general, 

 and are thus an attribute of the male sex. Professor Schaafi- 

 hausen cites numerous examples which prove that this connec- 

 tion exists both in animals and man. It will be found in 

 living persons that the imperceptible transition of the forehead 

 into the supraorbital margins is chiefly seen in women, whilst 

 the projecting eyebrows, frequently separated from the fore- 

 head by a deep groove, is peculiar to muscular males. The 

 same observations may be made on old skulls in which the 



Pig. 111. SkuU of Borreby, Denmark (Stone-Period), side view, after Busk. 



development of the supraorbital prominences greatly differs, 

 though all other characters are perfectly identical. Thus, 

 Professor His, of Basle, communicates to me the interesting 



