450 DIGESTIVE SYSTEM OF THE OX 
The formula of the deciduous teeth is: 
0) 0 3 
2{ Di-De-Dp- }= 20 
4 0 3 
TABLE OF AVERAGE PERIODS OF ERUPTION OF THE TEETH IN THE OX 
TEETH Eruption 
A. Temporary: 
First incisor! (Did) ip. cyeccrays AcMatie cena rcs ea Rune ) 
Second incisor (Di 2) Rane ent ce he | 
Mhirdsin ison DU Si hacdasckewe ls wiersee witlateterecs cate ee { 
Fourth incisor (Di 4). SP hes Ree ack Ohi CCR 
First cheek tooth (Dp 1) ers : : Birth to 3 weeks. 
Second cheek tooth (Dp 2) : a eye eae 
Mhirdicheekitoouh( Dp B)iq otieces-comese ciel b evs cisane. ss Birth to few days. 
B. Permanent: 
Birth to 3 weeks. 
Bins Gun Clsord (el) gsppeetes ts casts a epenererigsce tS; .. 1% to 2 years. 
Second incisor (I 2) . . Ss AP sai Shey. eee ge Phe .. 2to 24 years. 
Third incisor (13) .. a deause eis Hahcarl PADRYCaLS. 
Fourth incisor (I 4) E vr. . 38% to 4 years 
First cheek tooth (P 1) .... 2to 2)4 year 
Second cheek tooth (P 2) f : ; 114 to 2% years. 
Third cheek tooth(P 3) : ... 2% to3 years. 
Fourth cheek tooth (M 1) .. 5 to 6 months. 
Fifth cheek tooth (M 2) 1 to 11% years. 
Sixth cheek tooth (M 3) . 2to 2% years. 
The eruption of the permanent teeth is subject to great variation. The above 
figures are the average of observations of improved breeds under favorable condi- 
tions. 
Fic. 385.—Sanivary GLANDS OF Ox. 
a, Parotid gland; 6, mandibular gland; c, ventral, d, middle, and e, dorsal buccal glands; f, labial glands; 9, 
buccinator nerve; h, buccinator vein; 1, masseter (cut); 2, ramus of mandible; 3, zygomaticus muscle; 4, conical 
papill of lip; 5, buecinator muscle. (After Ellenberger, in Leisering’s Atlas.) 
