Genera}. Diseases. 345 



scrofula, rheumatism, or mercurialism. The cancellated 

 structure of the bone is the seat of inflammatory action. 

 • Symptoms. — Heat, pain, swelling of the integument over 

 the affected portion of bone; sometimes enlargement of 

 the latter, extreme tenderness on manipulation (often mis- 

 taken for rheumatism), and the patient exhibits more or 

 less inflammatory fever. If ostitis is confined to a limb, 

 there is attendant lameness, or the limb is not used. 



Treatment. — Perfect quietude, soft comfortable bed, hot 

 fomentations, or linseed" poultices ; and, subsequently, if in- 

 flammatory action is .protracted or enlargement persists, 

 the application of iodine paint, and administration of iodide 

 of potassium is indicated. 



In 1884 I received a cross-bred mastiff dog into my 

 infirmary, affected with cranial ostitis, caused by a violent 

 blow with a poker, over the right parietal bone. Blisters 

 and setons were employed, with general antiphlogistic 

 treatment, and the patient made a good recovery. 



PERIOSTITIS. 

 • TPeriostitis, or inflammation of the periosteum, may be 

 associated with ostitis, but is frequently met with in 

 canine practice as a distinct affection. The inflamed con- 

 dition of the membrane causes it to become highly 

 vascalar, thickened, and detached from the bone under- 

 neath, and, as in the case of "sfhnt" on the horse's leg, 

 Osseous deposit is frequently deposited between the bone 

 and periosteum, causing a permanent node or exostosis. 



Periostitis in the limbs of a dog is very often caused by 

 external violence, as a blow from a stick, stone, or kick. 

 It occurs also in connection with the teeth and jaws, and 

 under such circumstances is attended with acute suffering. 

 At the .present time I have a colley dog in the hospital, 

 which has for a considerable time been a martyr to inflam- 

 mation of the alveolo-dental periosteum. The removal of 

 a molar tooth with an exostosed fang afforded immense 



