xiv] BACILLUS TUBERCULOSIS 345 



undergoes diminution to almost complete disappearance, 

 but in about a fortnight or three weeks there occur in the 

 iris a crop of minute gray nodules which in reality are typical 

 young tubercles ; these gradually enlarge, and like all ordi- 

 nary tubercles undergo caseation ; while the tubercular 



Fig. 136. — Fi^M a Skction' through a Tubercle in the It\ft>' of a Raedit 



INFECTED IN'[-|;AVEN0USLY WITH CULTUKE OF TURERCLK UaCILI.I. 



Two giant-cells full of tLiljcrcle bacilli are seen in the tissue of the tubercle. 



process is at first localised to the iris, it gradually spreads to 

 the cervical lymph glands, and ultimately leads to general 

 tuberculosis of the other lymph glands and viscera exactly 

 as after subcutaneous inoculation. This typical production 

 of a crop of gray tubercles on the iris by tubercular matter 

 enabled Cohnheim and Salomonson to differentiate tuber- 



