EXERCISE 79. SARCINA GROUP. 



163 



Sarcina tetragena (GAFF KY) MIG. 

 SYNONYM. Micrococcus tetragenus GAFFKY. 



EXPLANATORY. First described in 1883 by Gaffky. It is found 

 in phthisical eavities and in sputum, and it occasionally occurs in 

 mixed infections as abscesses connected with carious teeth, about the 

 neck, jaws, and middle ear ; rarely elsewhere. 



REFERENCES. Gaffky, Langenbeck's Archiv, 1883, 28, 500; A. 

 326 ; C. 84 ; Fl. 2, 155 ; H. 172 ; L. & N. 171 ; Mig. 2, 225 ; M. & R. 187 ; 

 M. & W. 133 ; McF. 571 ; P. 472. 



MORPHOLOGICAL CHARACTERS : 



SKETCHES. 



1. FORM AND ARRANGEMENT: 



a. Bouillon 



* 



b. A gar 



c. Gelatin 



d. Other media 



2. SIZE: 



3. STAINING POWERS: 



a. Aqueous gentian- violet.. 



b. Loeffler's methylen-blue. 



c. Gram's stain 



d. Special stains 



4. MOTILITY : 



a. Character of movement.. 



b. Flagella stain 



5. SPORES: 



6. SPECIAL CHARACTERS: 



a. Capsules 



6. Involution forms 



c. Deposits or vacuoles , 



d. Pleomorphism 



