SPECIAL FORMS OF CONJUNCTIVAL INFECTION 169 



FlG. 26. DlPLOBACILLE LlQUKFIANT PETIT. 



SERUM AGAR. EXCLUSIVELY SHORT 

 DIPLO-FORMS (PETIT), x 800. 



liquefying gelatine ; he also only found it in cases of hypopyon- 

 keratitis. 



I have twice myself 

 obtained such Diplo- 

 bacilli from con j uncti- 

 vitis cases which re- 

 sembled clinically the 

 ordinary diplobacillary 

 conjunctivitis. I con- 

 sider it established that 

 the Petit type can also 

 produce the conjuncti- 

 vitis which has already 

 been described, especially 

 as Erdmann, by inoculat- 

 ing the human conjunc- 

 tiva with Diplobacilli 

 which grew freely on 

 agar, has succeeded in 

 producing a conjuncti- 

 vitis. 



The power to liquefy 

 gelatine and grow freely 

 on agar, which was 

 present at the outset in 

 my two earliest examples 

 of the Petit bacillus, 

 was gradually lost in 

 successive generations, 

 so that they more nearly 

 approached the Morax- 

 Axenfeld type. MacNab 

 conducted a further re- 

 search under my direc- 

 tion to see whether, by 

 continued growth under 

 varying conditions, it 

 might not be possible to 

 transform the one type 

 into the other. It was, however, not possible to develop in the Morax- 

 Axenfeld bacillus the power of liquefying gelatine, nor could it be pro- 



FlG. 27. DlPLOBACILLE PETIT. 



SERUM AGAR COLONY (PETIT). 



