642 



PRINCIPLES OF VETERINARY SURGERY 



On the fresh bone the periosteum is thick, resistant and 

 very adhesive. It covers the new formations. The micro- 

 scopic examination gives but an imperfect account of the 

 manner in which the vegetations are formed. It seems, 

 nevertheless, that they are formed at the expense of the 

 periosteum, which is very thick in the osteogenic layer. Its 



Fig. 104. 

 Osteoperiostitis of the Tarsus and Metatarsus (Radiograph). 



connective fasciculi are set upright, — perpendicular to the 

 long axis of the bone, — and serve as guiding channels for 

 the deposit of the osseous trabeculse. The periosteum is, 

 in fact, composed of osseous stalactites which cling to the 

 surface of the old bone. The radiographs clearly show this 

 arrangement. There is evidence that the bone has pre- 

 served its normal characters as regards thickness, direction, 



