ISOLATION OF MICROORGANISMS 



59 



hanging drop (see p. 76) to determine if more than one 

 kind of organism is present. 



4. If the colony is pure, pick up a portion with the 



o 



i 



sterile needle, or, in case of extremely small colonies, remove 

 the cover from the plate, focus the low power of the micro- 

 scope on the desired colony and while looking through the 

 microscope, fish the colony. 



