A CLINICAL STUDY OF THE SKULL. 19 



harmonious distribution of the blood-vessels is increased in its diam- 

 eters, while the angular process becomes wider. 



That the left dental arch is more deflected may be the result of a 

 diminished tonicity iu the masticatory and buccal muscles on this 

 side. This hypothesis agrees with the fact that the left frontal 

 eminence is commonly the smaller. 



The following measurements have been taken in illustration of 

 the data as above stated. No one specimen illustrates all the 

 points, nor is this to be expected in so variable a form as the human 

 skull. When in a given example a measurement is omitted it may 

 be understood that the result is negative, and not that the meas- 

 urement conflicts with the views as alread}^ given. 



No. 916, negro, A. N. S., aged 16 years : 



Longitudinal line overlies median suture of hard palate. 



Transverse line lies back of oval foramen, left ; iu front of the 

 foramen, right. The line is 4™" back of anterior border articular 

 eminence, right, 8°"° left. 



Distance from longitudinal line to outer border first molar tooth, 

 30°"" right, 28""" left. 



The left petrosal element has an angle of 60'', the vaginal process 

 50°, and the tympanic bone 20°. The right petrosal element has 

 an angle of 60°, the vaginal process 45°, and the tympanic bone 

 25°. 



Other peculiarities of this cranium included the lachrymal crest 

 joining the maxilla ; the perpendicular plate of the ethmoid bone 

 rudimental, with deep triangular notch reaching back to the second 

 molar tooth; the longitudinal palatal suture straight — the atlas 

 anchylosed to occiput. 



No. 917, negro, A. N. S,, aged 21 years : 



Longitudinal line overlies hard palate 2""" to left of longitudinal 

 suture. Transverse line 2"™ behind anterior border articular emi- 

 nence, right ; at level of border, left. 



