32 MANUAL OF BACTERIOLOGY. 



practice. Bearing this qualification in mind, the following 

 lists will serve as a guide. 



Bacteria that are stained by Gram's method : 



Staphylococcus pyogenes aureus, 



Streptococcus pyogenes, 



Micrococcus lanceolatus (of pneumonia), 



Micrococcus tetragenus, 



Bacillus of diphtheria, 



Bacillus of tuberculosis, 



Bacillus of leprosy, 



Bacillus of anthrax, 



Bacillus of tetanus, 



Bacillus aerogenes capsulatus, 



Ray fungus of actino mycosis. 



Of these the tubercle bacillus and the bacillus of leprosy 

 require a much longer exposure to the stain than other bac- 

 teria in the list. 



List of bacteria that are not stained by Gram's method : 



Gonococcus, 



Diplococcus intracellularis meningitidis, 



Micrococcus melitensis, 



Bacillus of chancroids (Ducrey), 



Bacillus of dysentery (Shiga), 



Bacillus of typhoid fever, 



Bacillus coli communis, 



Bacillus pyocyaneus, 



Bacillus of influenza, 



Bacillus of bubonic plague, 



Bacillus of glanders (bacillus mallei), 



Bacillus of Friedlander, 



Bacillus proteus, 



Spirillum of Asiatic cholera, 



Spirillum of relapsing fever. 



