CLINICAL CHRONICLES. 
389 
sensation and motion of her hind parts from the middle of the 
dorsal region backwards. The hobbles being removed, the ani¬ 
mal raised her head and fore legs, struggled once to get up, then 
turned her head back, looked at her hind extremities and fell 
back in a prostrate position. There being no doubt as to the 
injury she had inflicted upon herself, her owner was notified, and 
by his consent she was immediately destroyed. 
The post mortem showed a eomminutive fracture of the thir¬ 
teenth dorsal vertebra, the body of the bone being crushed into 
several pieces, with an oblique fracture of the annular portion, 
extending upwards about an inch above the spinal foramen. The 
spinal marrow corresponding to the seat of the fracture was almost 
divided, crushed as it had been by the fragments of the bone, 
the continuity being kept up only by its outside fibrous covering 
the dura mater. The fourth lumbar vertebra showed a large bony 
exsostosis upon the body of old standing. All the other organs 
were healthy. The mare was a long-loined animal, with a some¬ 
what narrow belly. 
The regularity with which the dental apparatus develops itself 
in the buccal cavity is sometimes subject to various changes, 
either in the number of the teeth, their mode of development or 
their way of growth. Numerous cases are recorded where the 
incisors and molars have presented peculiar abnomalies. Double 
rows of teeth ; variations from the regular number; their devel¬ 
opment in parts of the head where the dental follicle has been 
carried by a peculiar mode of traveling, so to speak; their pres¬ 
ence in the structure of the temporal bone, or in the anfractuous 
cavities of the sinuses ; all these can be found in some of the 
special works on equine dentistry. We remember a peculiar case 
where a supplementary seventh molar tooth, situated in the lower 
maxillary, has given rise to peculiar symptoms of disease which 
ended fatally. The following case, which was presented to the 
clinic of the American Veterinary College through the kindness 
of Dr. John Dougherty, will prove most interesting, not only on 
account of the number of molars which existed in both jaws, but 
