XI] 



BACILLUS : PATHOGENIC FORMS. 



121 



the tubercle-bacilli have been shown to exist. They are most 

 numerously found in the caseous masses in the lung found in 



FIG. 84. FROM A PREPARATION OF CASEOUS MATTER FROM PULMONARY 

 DEPOSITS is BOVINE TUBERCULOSIS, STAINED AS IN PRECEDING FIGURE. 



Magnifying power 700. 



FIG. 85. FROM A SECTION THROUGH TUBERCULOUS DEPOSITS IN THE LUNG 



OF A COW. 



Two giant-cells and two small cells containing tubercle-bacilli. 

 Magnifying power 700. 



bovine tuberculosis. Here Koch found them not only scattered 

 through the caseous masses, but also in the well-known giant- 

 cells ; in some cases they form a more or less regular zone in 



