PLATE XI. 



FIG. 1. Bacillus anthracis from liver of mouse. The spherical 

 objects are fat globules from the crushed liver tissue. The longer 

 filament shows transverse septa, referred to by Koch. X 1000; 

 Zeiss's T ^ in. objective. Methyl-violet staining. 



FIG. 2. The same bacillus (B. anthracis) from liver of mouse. 

 X 500. Aniline brown staining. 



FIG. 3. Epithelioid cell containing several of Koch's Bacillus 

 tuberculosis. From sputum of phthisical patient, stained by Ehr- 

 lich's method. The bacilli and the outlines of the cell containing 

 them can scarcely be perceived. (See remarks on p. 196.) X 1000 

 diameters; Zeiss's ^ in. objective. Fuchsin staining. 



FIG. 4. Spore-bearing filament of B. anthracis, from culture 

 in chicken bouillon. Scattered spores and fragments of filaments 

 which had broken up without producing spores, are also seen. 

 X 500 diameters. Methyl-violet staining. 



FIG. 5. Bacilli from surface of gutter-water; Baltimore, 1881. 

 X 1000 diameters. Methyl-violet staining. 



FIG. 6. Tubercle bacillus from sputum of phthisical patient. 

 A close inspection will show that it contains spores. (See remarks 

 on p. 394.) X 1000 diameters by Zeiss's -f% in. objective. Stained 

 with fuchsin by Ehrlich's method. 



FIG. 7. Bacilli from pleural cavity of rabbit, which suffered 

 an attack of acute pleuritis, with fibrinous and serous exudation, 

 as a result of an experimental inoculation with contaminated water 

 (Water No. 5, Professor Mallet's experiments). The source of 

 contamination is unknown to the writer, and the figure is simply 

 introduced to show another species of bacillus, possibly pathogenic, 

 and to call attention to its resemblance to the bacillus shown in 

 Fig. 8. X 1000; Zeiss's -^ in. Methyl-violet staining. 



FIG. 8. Bacillus from normal human saliva; culture-experi- 

 ment in acid malt-extract solution. X 1000 ; Zeiss's ^ in. 

 Methyl-violet staining. 



