26 10UM AND DIMENSION 



"bacteria : and a special one, referring only to a particular form of growth, as 

 just mentioned. 



A bacterial cell of the bacillus type which, during a certain physiological 



I i;. 4. Illustrations of the manifold variety in size :in<l form of different bacteria. 



Kxcept A 4 and A v all the other illustrations arc representations of equally magnified 

 bacti-ria from :i single drop of putrex-.'in lilnu:! < //'/./ /'. li(iniinjnrt> //.) ."Ma--. 950. '1'liose in 

 ;i!l svinnii-trical cells, ilmse in B are elongated. 



A. I. Cocci (inicrocncciis) of various >iz-s. 



2. Diplococci of various >i/ 

 Mn-jiiocncci of various - 



4. Micrococcus tei raijoiiiis (from a pure culture). Mai;. 950. 



'(ina vi'iitriculi. May. 700. 

 6. Stnpliylococci. 

 B. I, 2. 4. Separate loiiy rods of various lenulli^ ancl lircadlli>. 



3. Short rod-, partly of biscuit form. 



5. Chains, composed of cither short or Inny rod-. 



6. Lony threads. 



process (to be studied later on under UK- n-.nnu of "spon- forinalinn "). swells out 

 like a spindle < club, is genei-ally termed a clostridium. 



If tli<- rod is ai-clicil like a how or bent in the form of a comma, it is spoken 

 of as a vibrio, and if the bends be repeated several times, then a wavy kind of 

 growth denoted spirochaete ensues. When the bend departs from the level 

 plane and shapes itself in >uch a manner that it can be applied to the surface of 

 a cone or cylinder, the type of growth bn-omes .spiral, and is designated spirillum. 



