276 



TUBERCULOSIS 



manner at the periphery, occasionally also in epithelioid) celk 

 and in leucocytes. ^^2 "" *" 



The above statements, however, apply only to tuberculosis 

 in the human subject, and even in this case there are exceptions. 

 In the ox, on the other hand, the presence of tubercle bacilli 

 within giant-cells is a very common occurrence ; and it is 

 also common to find them in considerable numbers scattered 



Fig. 77. — Tubercle bacilli in giant- cells, showing the radiate 

 arrangement at the periphery of the cells. Section 1 of tubercular 

 udder of cow. 



Stained with carbol-fuchain and Bisniarck-browii. x 1000. 



irregularly throughout the cellular connective tissue of the 

 lesions, even when there is little or no caseation present 

 (Fig. 77). 



In tuberculosis in the horse and in avian tuberculosis the 

 numbers of bacilli may be enormous, even in lesions which are 

 not specially acute ; and considerable variation both in their 

 number and in their site is met with in tuberculosis of other 

 animals. 



In discharges from tubercular lesions which are breaking 



