CHAPTER XIX. 



Micrococcus Aureus — Micrococcus Pyogenes and Citreus — Staphylococcus 

 Epidermidis Albus — Streptococcus Pyogenes — Micrococcus Gonor- 

 rhasae — Micrococcus Intracellularis — Pseudomonas jEruginosa — Bacil- 

 lus of Bubonic Plague. 



MICROCOCCUS AUREUS (ROSENBACH), MIGULA, 1900. 



Synonyms: Staphylococcus pyogenes aureus, Rosenbach, 1884; Micro- 

 coccus pyogenes aureus, Migula, 1895 ; Micrococcus pyogenes, Lehmann and 

 Neumann, 1896. 



Prepare a set of plates of agar-agar from the pus of an 

 acute abscess or boil that has been opened under antiseptic 

 precautions. Care must be taken that none of the antiseptic 

 used gains access to the culture-tubes, otherwise its restrain- 

 ing effect may be operative and the development of the 

 organisms interfered with. It is best, therefore, to take a 

 drop of the pus upon a platinum-wire loop after it has been 

 flowing for a few seconds; even then it must be taken 

 from the mouth of the incision and before it has run over 

 the surface of the skin. At the same time prepare two or 

 three coverslips from the pus. 



Microscopic examination of these slips will reveal the 

 presence of a large number of pus-cells, both multi-nucleated 

 and with horseshoe-shaped nuclei, some threads of disin- 

 tegrated and necrotic connective tissue, and, lying here 

 and there throughout the preparation, small round bodies 

 which will sometimes appear singly, sometimes in pairs, 

 and frequently will be seen grouped together somewhat like 

 clusters of grapes. (See Fig. G6.) They stain readily and 



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