LAMENESS. 
65 
commenced growing from the fractured side of the condyle imme- 
diately after the setting in of inflammation, and the natural infer- 
ence is, that the same inflammation which seized the broken 
condyle, spread itself upon the capsular ligament, and thence into 
the cavity of the shoulder joint, as well as upon the periosteum 
covering the epiphysis of the bone ; in one case causing opening 
of the joint, in the other the conversion of the fibrous tissue into 
bone. 
These are observations then that will serve us as data where- 
upon we may safely ground our theorizations on certain phe- 
nomena which present themselves in such diseases of joints of 
spontaneous — or apparently spontaneous — origin as resemble those 
arising from external injury. In spavin, for example, we have 
disease within the hock joint, and disease without it, the same 
as we have in several other joint affections; and it becomes 
necessary for us in all such cases to understand the connexion 
between the internal and external disease, and how either may 
exist independently of the other. There are few subjects that, 
heretofore, have had less attention paid to them, and consequently 
whose real nature has been less understood, than lameness arising 
from disease of the joint : every year of the present age, however, 
is adding to our knowledge of them, so much so, indeed, that we 
may safely predict that lamenesses hitherto classed as “ obscure” in 
their nature, will in a few* years become readily explicable by us. 
And this will be accomplished by observations such as are afforded 
us by cases we have had opportunities of watching in their progress 
from their beginning to their very end. 
Concerning the Formation of New Bone, Dr. Watts, 
from a close and critical observation of four cases of injury and 
disease of bone, has come to the following conclusions: — 
“ 1st. That the theories alleging that new bone is formed only 
by living parts of old bone, in cases of necrosis and fracture, are 
incorrect.” 
“2d. That the periosteum has evidently the power to produce 
new bone of itself, without the aid of the old bone.” 
“ 3d. That the formation of new bone by the periosteum consists, 
at first, in the deposition of osseous matter in the form of a fine 
microscopic network ; and therefore, that the Haversian canals are 
only a secondary, not a primary, osseous tissue.” 
4th. That in cases of necrosis and fracture, the process of re- 
production of bone by the periosteum is the same*. 
For the Causes of Bony Formations, in the horse’s limbs 
Edinburgh Med. and Surg. Journal. 
