VE TERINA R Y DEN TAL S URGER Y. 157 



they grew to the height of three inches. The 

 fourth and fifth teeth of the right side of this rare 

 anatomical specimen are absent. Perhaps they were 

 carious. The rarefied and spongy tissue of the 

 socket bones indicate the seat of an alteration, prob- 

 ably caries which was the point of departure of 

 the general tumefaction. The last tooth by its 

 oblique direction towards the empty sockets, indi- 

 cates that the loss of the teeth occurred during the 

 life of the animal, some time perhaps prior to its 

 death. The defect of the right side doubtless forced 

 the animal to use the left for the purpose of masti- 

 cation. In such cases the teeth that do not wear, 

 grow till they reach their respective opposite jaws, 

 even when those at the opposite side of the mouth 

 are in exact contact, an anomaly never produced in 

 the normal state. The function of mastication oper- 

 ates according to the obliquity of contact and paral- 

 lelism is established by friction between the tables 

 which normally would be superposed." 



The following case was reported in the American 

 Veterinary Review Vol. IX., p. 321 : 



IRREGULAR WEARING IN THE MOLARS OF A 

 HORSE NECROSIS OF THE PALATINE BONE. 



DESCRIPTION OF A SPECIMEN PRESENTED BY B. MC INNESS, 

 JR. V. S., TO THE MUSEUM OF THE AMERICAN VETERIN- 

 ARY COLLEGE. BY J. SCHRIEBLER, D. V. S., CURATOR OF 

 THE MUSEUM. 



" The preparation exhibited was the head of an 

 old horse which had been the property of an aged 



