BACTERIOLOGICAL TECHNIQUE 



17 



vegetable life. Under a high-power microscope they appear 

 as minute round dots, rods or threads ; they multiply either by 

 splitting into two (that is, hj fission or cell division), or by the 



o o 

 ° 0° o 



ff°" 



^ 



9d 



Ootxaocf 



^^^^^y^A/^^ 



I. Baotekia. 



L^ 



ft 



8 "C? CO 



II. Yeasts. 



III. Moxn-DS. 



1\ Bbgoiatoa. 



Tig. 3.— Bactbeia, Yeasts, Moulds, and Bbgqiatoa. 



production of small protuberances, which separate eventually 

 from the main organism and develop into fresh organisms 

 similar to the parent organism ; this method of reproduction 

 is known as spore formation. Bacteria are colourless, that is, 



