PLATE 20. 



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typhosus. Film preparation from agar, 16 

 hours at 37 C. Stained with carbol fuchsin 

 X 1000. 



" 







>AL-GRUBER REACTION. Agglutination of B. 



typhosus by blood serum of a typhoid Bacillus 



patient, x 400. 



Bacillus typhosus, showing flagella. x 1000. 



is. From human mesenteric gland. Stained with 

 methylene blue, x 750. 



(To face page 302, 



