46 
The 
THE DOGS SKULL. 
to bone, consisting of a laminated matrix with 
lacunz, canaliculi, and, when of considerable 
thickness, vascular canals agreeing with Haver- 
sian canals. 
Pulp occupies the central portion of the tooth. 
It is richly supplied with blood vessels and 
nerves and consists of a gelatinous connective 
tissue, containing numerous cells. It is largest 
in developing teeth, often in later life becoming 
converted into a form of dentine. 
As the teeth are used largely by anatomists 10 
diagnosing the characters of the skull a “dental 
formule” has arisen, expressing by numbers, or 
letters and numbers, the nature of the dentition. 
Thus we express the Pees na pimalt an den- 
tition as follows: 14,.c¢-. p,m 2——> total 44, 
the letrersnis «c. -p, aa, ee for incisors, 
canines, premolars, and molars. It being suf- 
ficient to enumerate the teeth on one side of 
the jaw only, it may be abbreviated to sucha 
formula as the following : 
Man 3733=32 Dog 3775= 42. 
Where the incisors are separated from the 
molars by a gap (as in Rodents) the space is 
termed a diastema. 
a. The teeth of the upper jaw. 
ii The ineisors. There are six in the 
upper jaw, in alveoli in the premax- 
illa. The last—z 3—is much larger than 
those in front of it. Each has a single 
