( III ) 
defcending % Inches, it becomes 6 Inches broad ( b .) and two In- f/g 
ches chick at its back-part, where it forms an obtufe Angle * 
whence running forward at its outer fide 2 Inches, it begins to 
form | Simu for Infertion of the Mufcles which move the Jaw. 
This Sinus running forward 4 Inches more, terminates in a 
fharp edge of the Bone, which defcends to make up the SProcdfm 
Corona (. b.b.) This Sinus is 8 Inches from above to below: At 
the upper part of the Procejfus Corona , 'tis 8 Inches broad from 
before, where ’tis fharp, to behind, where tis thick and obtufe, 
and at its middle 9 i Inches ( b . b .) the Procejfns Corona from a- pig 
bove to below 6 Inches, with, as it were, a Semicircular edge, 
but fomewhat more Protuberant, where ’tis not fo fharp as the 
Margin above. How we come to the inner fide of the fame part 
of the Bone, where we find that defcending 7 Inches from the 
Condyle, till we come a little below the forefaid obtufe Angle, 
there are the beginnings of a large Hole (b.b) 3 \ Inches long, 
•viz. from the firft framing of its Sinus to its lower part, and 
1 = Inch broad. This Hole is for receiving the Veflels fit for 
forming and nourifhing the Teeth $ whereof hereafter : Here the 
Jaw begins to be about 4 Inches thick behind, being convex in 
its back-part 3 whence running 4 Inches forward, it inclines a- 
bout 2 7 Inches inward, where it forms a large Sinus for infertion 
of the Mufculus Maffeter , and whereof no Idea could be given in 
the Figure 1 , for theoutfide always obftrufted the view of tbein- 
fide. This Sinus defcends obliquely from the Neck of the Con- 
dyle, till it comes to the Root of the Teeth ( c. ) 9 Inches, which 
fpace does not appear fo large in the Figure, becaufe of the Poll, 
tion of the Jaw, and from the fore part of the Coiona backward, 
till the Jaw become thick, 5 ^Inches : From the back-part of the 
Jaw at the forefaid obtufe Angle, till you come to the Point of 
the Proccffus menti ( h.) in a ftreight Line, is 27 Inches. The 
Arch of the back Surface from the fame Angle, till you come 
equal with the beginning of the Teeth, or lower part of the Co- 
rona (c.) is 14 i Inches ^ from whence meafuring outward from, 
the Root of the Teeth, it is % Inches to the forefaid lower part 
of the Corona ; from thence to the middle of the back part 5 In- 
ches • and from the Root of the Teeth at the External to the fame 
place at the Internal Part, is 16 Inches ; and here the Jaw is a- 
bout 4 Inches thick behind. At the joining of the two Teeth 
ftreight downward, ’tis 6 i Inches j and here it inclines gradually 
outward for above 3 Inches; whereas its inner Surface is almoli; 
plain, or at leaft for the fpace of 4 Inches, and then inclines ; 
P 2 gradually 
