A CYST MISTAKEN FOR GLAKDERS. 117 



of a lamb two months and a half old ('Recueil de 

 Med. VSterinaire,' 1835, p. 586). 



" In most instances only one tooth is found. Gurlt 

 was the first to find, on the mastoid process of the 

 temporal bone, a mass of molar teeth fused, as it were, 

 together. The tumor was three inches and a half 

 high, and about two in its largest diameter. The horse 

 had been destroyed for glanders. Goubaux found two 

 at the posterior portion of the sphenoid bone, and Bay 

 four. In a cyst of the testicle Gurlt discovered six 

 teeth, three separate and three in a mass. Bay at- 

 tended a horse in 1860 that appeared to be suffering 

 with encephalitis. It died twenty-four hours after his 

 visit. It had always shown, on the right temporal re- 

 gion, a tumor without a fistula, but it did not attract 

 notice, as it apparently caused no inconvenience. Nine 

 years afterward, when Bay was preparing the head as 

 a pathological specimen, he discovered this supposed 

 exostosis to be constituted by the union of four molar 

 teeth. The two superior teeth projected from the 

 temporal articulation, and the inferior two were situ- 

 ated in the petrous portion of the temporal bone, in- 

 clining obliquely from within outward. The posterior 

 portion of the latter projected in a very salient manner 

 at the setta turcica, and must have produced much 

 pressure on important parts of the brain. 



" Age does not appear to have any influence on the 

 development of these cysts, the animals in which they 

 have been observed ranging in age from eight or nine 

 months to fifteen years. The period of formation also 

 varied greatly. In regard to the side of the body in 

 which they were developed, in seventeen cases they 

 were on the left, and in thirteen on the right. In 

 fourteen cases observed by Macrops, they were i 



