OSTEO-POROSIS. 



185 



Mr. Eobinson of Greenock, have seen it frequently ; and I am 

 indebted to them for many valuable hints upon the peculiarity 

 of the symptoms, and for specimens of the bones of the head 

 sufferincj from the disease. 



Fig. 31. 



Fig. 32. 



Figs. 31 and 32.— Cranio-facial bones affected with osteo-porosis ; the 

 front view, Fig. 31, representing the enlarged condition of the face ; and 

 Fig. 32 showing the disease extended into the alveolar cavities. 



As a rule, the bones of the face are the first to suffer ; but 

 this is liable to exceptions, as the following extracts from the 

 Veterinarian of 1860 will show. The symptoms were de- 

 scribed to Mr. Varnell by a Mr. Wallin : — " My attention," says 

 Mr. Wallin, " was in most instances first directed to defective 

 action, perhaps in one joint or limb only, in which, upon exami- 



