PRINCIPLES OF VETERINARY SURGERY 507 



tinomycostic tubercles the size of beans. With the exception 

 of the lesions affecting a large portion of the perenchyma, 

 grave pulmonary lesions are exceptional. The udder may 

 be attacked, in which case the infection occurs through the 

 milk channels. It is manifested by the development of neo- 

 plasms of a variable volume in the parenchyma, or by a 

 glandular sclerosis that is not unlike tuberculosis.' The tu- 

 mors form abscesses that become ulcerated at the surface 

 of the skin. Bang, Harms, Jensen, Johne, Erhardt, Wil- 

 liamson and Korevaar have observed actinomycosis of the 

 udder. Tumors may grow under the skin in different parts 

 of the body, but especially in regions exposed to wounds of 

 the integument. Jensen noticed an actinomycosis of the 

 knee; Lupke in the interdigital space; Nystrom in the re- 

 gion of the phalanges; Le Blanc a neoplasm on the outside 

 of the leg; and Preusse a tumor on the inner aspect of the 

 hind leg. 



The parasite may afifect the generative organs and the 

 spermatic cord after castration. The muscles may be en- 

 croached upon, but this localization is exceptional. The 

 bones, notably the vertebrae, and the bones of the cranium, 

 are sometimes attacked. MacGillivray reports a cow that 

 exhibited symptoms of general paralysis, and at the autopsy 

 he found a tumor in the lungs and an actinomycoma of the 

 first dorsal vertebra. Jensen found nests of actinomyces 

 in the sternum, and Bang in the metatarsus. Pieroni refers 

 to an ox presenting the symptoms of turnsickness that 

 proved on post-mortem to have suffered from the effect of 

 an irregular actinomycoma in the internal surface of the 

 cranium. 



PATHOLOGICAL ANATOMY.— (a) Lesions of the 

 Maxilla. — The tumors developed in superficial structures 

 are composed of a hard, lardaceous tissue, riddled with 

 abscesses of small dimensions, containing purulent product 



