A CLINICAL STUDY OF THE SKULL. 77 



with this variety a common interest, namely, a disposition to pre- 

 mature disappearance of the sagittal suture associated with retarded 

 ossification of the parietals, as a result of which they become unduly 

 convex. 



The third variety is confined to the anterior cranial segment — 

 i. e., a phase of deformation in which all the peculiarities are in the 

 frontal bone or in the bones of the face. The frontal eminences 

 may be too near one another; the metopic suture may be here and 

 there carinated; the muscular ridge at the anterior border of the 

 temporal fossa may be unduly prominent; the inferior border of 

 the orbit at the region of the union of the malar bone and the line 

 over the infra-orbital canal may be roughened, etc. Many of these 

 peculiarities are associated with errors in the shape of the mouth 

 and the nasal chambers, and easily come within the range of ana- 

 tomical studies which are suggested by clinical observations on 

 catarrhal diseases of the respiratory mucous surfaces. 



Addendum. — The number of skulls stated on 8th line from bottom page 

 29 refers to others than those in the collection of the Academy of National 

 Sciences. 



