12 



3Ianual of Veterinary Microbiology. 



Fig. I. 



Rounded microbes or cocci have received the follow- 

 ing names, according to the manner in which they are 

 grouped: 



3Iicrococcus : cocci isolated, 



(Fig. 1, 1) ; 



Diplococcus: cocci arranged 

 in pairs, (2) ; 



Streptococcus : cocci ar- 

 ranged in linear series, in 

 chains, (3) ; 



Hicrococcus tetragenus: cocci 

 arranged in groups of four, 



(^); 



Sarcina : cocci arranged in 

 tetrads so as collectively to 

 form a cube. 



Staphylococcus : cocci associated in clusters ; 



Zobgloca: cocci associated in large numbers in an 

 amorphous matrix, (5) ; 



Ascococcus : cocci associated in large numbers in an 

 amorphous matrix and inclosed in an enveloping mem- 

 brane, (6). 



The elongated microbes are cylindrical or fusiform 

 rods, or have the shape of a bell clapper. They have 

 received the following names : 



Bacillus : rods short and straight, (7) ; 



Leptothrix: rods long and undulating, (8) ; 



Cladothrix: rods long, straight, and branching, (9). 



Spiral microbes are in the form of an arc of a circle, 

 or are spiral. They appear, however, with rectilineal 

 forms when their curvature is directed toward the ob- 



jective, 

 them : 



The following: terms are used to designate 



