CLASSIFICATION 5 



(2) MicroGoccus. Irregular grouping, Micrococci form- 

 ing clusters in an arrangement suggestive of that of grapes 

 on a bunch are still known as Staphylococci, though 

 there is a movement among the precise to eradicate the 

 word. 



(3) Sarcina, or Packet Cocci. Division in three direc- 

 tions, forming packets of eight or more elements, which 

 remain associated in more or less cubical masses. 

 Non-motile. 



(5) 



II. BACTERIACEJE. Straight rod forms. 



(1) Bacterium. Non-motile organisms. The name has 

 been variously applied in other sj^stems of classification. 

 In one it signified a very short rod, and in another a rod of 

 a non-sporing species. In its plural form it is used as a 

 general term for all the organisms included in this table; 

 otherwise it has fallen into disuse. 



(2) Bacillus. Migula applied the term to rods possessing 

 both polar and lateral flagella. It is now customary to 

 apply the name to all rod-shaped organisms i.e., all of the 

 Bacteriacece. 



(3) Pseudomonas. Rods with polar flagella only. The 

 title is now seldom used except for some bacilli concerned 

 in the nitrogen cycle, and for others concerned in plant 

 diseases. 



III. SPIRILLACE/E. Curved or spiral rod forms. 

 Migula divides this family into three genera: non-motile 



organisms (Spirosoma); motile forms with a single polar 

 flagellum (Microspira) ; and motile forms with more than 

 one polar flagellum (Spirillum). Other classifications 

 apply the name Spirillum to a larger class, causing much 

 confusion in nomenclature. The result is that any member 

 of the family may now be properly referred to as a spirillum, 

 though the term is often restricted to those organisms 

 having three or more definite corkscrew turns. Short 

 curved rods are commonly termed ' vibrios,' or ' comma ' 

 bacilli, but the latter name is frequently used for, and 

 should be restricted to, the cholera vibrio. 



IV. CHLAMYDO-BACTERIACE.E. Thread forms not con- 

 taining sulphur granules. 



(1) Streptothrix. Forms showing true but not dichoto- 

 mous branching. 



