22 



THE OEGANISM IS A MICEOCOCCUS. 



THE GELATINE IS NOT LIQUEFIED. 



THE COLONIES ABE WHITE, CONFLUENT, AND 

 GEOWING EAPIDLY. 



THE COCCI- AEE AEEANGED AS TETEADS OE 

 AS SAECIN^. 



Micrococcus tetragenus, very common in phthisical sputum, also 

 found in normal saliva and in pus ; microoooci 1 /i in diameter, 

 dividing in two directions, forming tetrads united by a gela- 

 tinous envelope ; grows rather slowly at ordinary temperature, 

 as small white spherical colonies ; stains well by Gram. 



Sarcina pulmonum (Hauser), from phthisical sputum; cocci 1 to 

 1'5 fi in diameter, in tetrads or packets ; forms a pearl-gray 

 layer on gelatine ; when cultivated in urine causes ammoniacal 

 decomposition of urea. 



