256 PATHOGENIC BACTERIA. 



anilin-water-fuchsin solution for a few moments, sections 

 in the same solution cold for twenty-four hours ; then 

 immerse them first in a weak, then in a strong, solution 

 of chlorid of iron. The cover-glasses are washed in 

 water, sections in alcohol, and subsequently passed 

 through the usual reagents for dehydration and clearing. 



% 



FIG. 67. Bacillus of syphilis (Lustgarten), from a condyloma; x 1000 (Itzerott 

 and Niemann). 



In some syphilitic tissues these methods suffice to de- 

 fine distinct bacilli with a remarkable similarity to the 

 tubercle bacillus. The organism is about the same size 

 as the tubercle bacillus, and even more frequently curved, 

 but often presents a club-like enlargement of one 

 end (involution-form?). The bacilli very frequently 

 occur singly, though more often in groups, and never lie 

 free, but are always enclosed in cells. These bacilli are 

 not always found in syphilitic lesions, nor is their dem- 

 onstration easy under the most favorable circumstances. 

 Lustgarten emphasizes particularly that they are only 

 demonstrable after the most painstaking technical pro- 

 cedures. 



The probability of the specificity of this organism was 

 considerably lessened by the observation by Matterstock, 

 Travel, and Alvarez that in preputial smegma, and also 



