EXPLANATION OF THE PLATES. 



Fig. 1 represents Staphylococcus pyogenes citreus, from an 

 agar-agar culture; in addition to single cells, diplococci, 

 tetrads, and short threads consisting of three cells hanging 

 together, are seen. Stained with aqueous solution of fuch- 

 sine. 



Fig. 2. Micrococcus gonorrhcese stained with methylene 

 blue See text. 



Fig. 3. Streptococcus erysipelatos, stained for 24 hours 

 with very dilute aqueous gentian-violet solution. 



Fig. 4. Threads of the anthrax-bacUlus, with spores. 

 Stained with hot aniline water fuohsine, decolourised with 

 sulphuric acid, so that only the spores remain stained. 



Fig. 5. Bacillus tuberculosis, preparation has been made 

 from sputum very rich in tubercle bacilli, stained with hot 

 aniline water fuohsine, decolourised with nitric acid, and 

 not re-stained, so that only the bacilli are to be seen in the 

 photograph. 



Fig. 6. Cholera bacilli from a somewhat old cultivation, 

 on which account the individual cells are not uniform. 

 Stained for twenty-four hours with acqueous carbolic fuoh- 

 sine solution. 



Fig. 7. Typhoid bacilli from an agar-agar cultivation, 

 stained for twenty-four hours with aqueous gentian violet. 



Fig. 8. Typhoid bacilli with flagella, stained according to 

 Loffler's method. 



