246 



the jawbone may be the favourite site selected, the more so, as it is 

 a peculiarity of scrofulous diseases in cattle, that only one site is 

 chosen as an external diseased centre from which the concomitant* 

 disorders slowly spread. 



We shall, I believe, more rightly attribute the cause to some un- 

 healthy taint in the constitution, such as scrofula or tuberculosis — 

 tubercle has already been found in the matrix of specimens and both 

 Gangee and Williams attribute this disease to a tubercular diathesis. 

 The Tuberculosis Board of Inquiry in Victoria state as one of the 

 results of their investigationsthat the so-called "cancer " of the jaw 

 " is in the great majority of instances a purely scrofulous affection." 



Further in the neighbourhood of the growth, may be found 

 examples of tuberculous nodules in the tissues adherent to the bone. 



Again the microscopic appearances of the glands adjacent and 

 of the tumours in the lung and liver found in cases of osteosarcoma 

 coincide with the appearances seen in the same organs, when an 

 animal is suffering from tuberculosis. Though I have examined 

 several specimens, I have not yet come upon cells which in any way 

 resemble those of cancer. Moreover tho' in advanced stages of 

 osteo-sarcoma the soft parts are adherent to the bone, there is no 

 general brawniness and adhesion of surrounding parts to the extent 

 met with in cases of confirmed cancer. The presence of calcareous 

 particles in the deposit is just what we might expect in cases of 

 tubercle though not often, if ever, seen in cases of cancer. 



* WiUows Report. 



