STAPHYLOCOCCUS PYOGENES AUREUS 323 



Although exhibiting marked Brownian movements in the hanging 

 drop, staphylococci are non-motile and possess no flagella. They are 

 non-sporogenous and form no capsules. 



Cultural Characters. Staphylococci grow readily upon the usual 

 laboratory media. The simpler media, made of meat extract, are quite 

 as efficient for their cultivation as are the freshly made meat-infusion 



FIG. 70. STAPHYLOCOCCUS COLONIES, 



products. The optimum temperature for staphylococcus cultivation 

 lies at or about 30 C., though growth readily takes place at tempera- 

 tures as low as 15 C., and as high as 40 C. Slow but definite growth 

 has been observed at a temperature as low as 1 C. 



While development is most characteristic and luxuriant under 

 aerobic conditions, staphylococci are facultatively anaerobic on suitable 

 media. They grow readily in an atmosphere of hydrogen. 



