BINOCULAR MICROSCOPE FOR STUDY OF BACTERIA 125 



hand side open. An uncovered plate culture might then be 

 slipped under this glass screen with very Uttle danger of dust 

 or breath contamination and at the same time permit the fishing 

 of colonies, under microscopic observation, with a platinum wire. 

 The most satisfactory platinum wires for this pui-pose were 

 drawn out in the fiame to a fine point which was then turned at 

 a rif!;ht angle about 1 mm. from the tip. 



The chief value of the apparatus in this laboratory has been 

 in the isolation of organisms producing very small colonies from 

 material containing large numbers of other species, i.e., the 

 isolation of H. infliienzce from sputums. It is a very easy matter 

 to fish the smallest H. influenza: or similar colonies of other 

 species, or to remove half of such a colony and smear for micro- 

 scopic observation and later to use the remaining half colony for 

 the inoculation of subcultures. 



