548 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXI. 



Measurements of orbits. 



a From about the middle of the lower boundary of the orbit to the highest point above. There is 

 often at the lower edge a slight eversion, or bevelling, which must be neglected, the true boundary 

 of the orbit being just jKisterior to it. 



b From a point of meeting of the mesial part of the boundary of the orbit and the fronto-maxillary 

 suture, aliiiidmtuk which corresponds near todacryon in man, to the most distant point on the exter- 

 nal boundarv line of tlie orbit. Both measurements are conveniently talien with the grafluated 

 shaft of the sliding cumpass, whose extremity has been sharpened, and are, with the index, ilirectly 

 comparable with those obtained by Broca's method in man. 



The orbital height follows to a certain extent the growth of the 

 length of the face, but it also bears a special relation to age and partic- 

 ularl}' to sex. It is, relatively to the facial length, somewhat greater 

 in the .young and in the females than in the adults and in the males. 



The following table shows these conditions quite clearly: 



Relation of the mean height of the orhiisiu tlie upper leugthof the face. Len(Jh <ffliefice = 100. 



ADDITIONAL CHARACTERISTICS. 



The vault of the orang skulls has, when viewed from above, a pyri- 

 form shape, the smaller extremity corresponding to that part which 

 lies immediately posterior to the orbits. The outline of the lateral 

 plane is oval, while that of the norma occipitalis, without the crests, is 

 intermediary between quadrilateral and circular, never pentagonal as 

 in man. 



