SWALLOWING A S0U:N'D TOOTH. 193 



calculus, as indeed may any similar body, which fact 

 has been demonstrated by Prof. Morton, of the London 

 Veterinary College, in an excellent paper on 'The For- 

 mation of Calculus Concretions in the Horse.*"* 



Surgeon AV. A. Cartwright reports that he extracted 

 three grinders from a 'quidding' mare, one of which 

 she swallowed ("Veterinarian," vol. iii, second series, 

 p. 277). The tooth was sound, which may account for 

 the favorable result of the case. 



* Tlie Enterprise, pnblislied in Virginia, Nevada, in its issue 

 for Decambei- 12, 1878, contains an article entitled " A Stone 

 found in a Horse's Jaw," which is in substance as follows : " For 

 a long time a lump has been noticed in the side of the jaw of a 

 horse belonging to Superintendent Osbiston, of the Gould and 

 Curry and Best and Belcher mines. It was near the jawbone, 

 and no liniment had power to soften or drive it away. Yester- 

 day a veterinary surgeon made an incision, and to his astonish- 

 ment removed a stone about two inches long and one inch in 

 diameter. It is yellowish-white in color, and apparently as hard 

 as marble. Mr. M. M. Frederick, the jeweler, divided it longi- 

 tudinally, and in its center was what appeared to be a petrified 

 grain of barley, which was also divided longitudinally. Around 

 this nucleus the stone had formed in regular layers, the rings of 

 which could be distinctly traced. The material of which the 

 stone was composed appeared to be the same as that of the in- 

 crustations on the tubes of boilers. It is conjectured that the 

 grain of barley pierced the gum and imbedded itself in the flesh, 

 and that the saliva, flowing in, deposited limy matter similar to 

 that which is sometimes found on the teeth of horses as well as 

 men. A small concretion having thus been formed, it gradually 

 grew, the channel by wiiich the grain of barley entered no doubt 

 remaining open and allowing an inflow of saliva." 



Tiie above case is another proof that Dr. Dunglison was right 

 when he said that calculi "may form in every part of the animal 

 body." 



9 



