92 



METHODS OF OBSERVING BACTERIA 



On the other hand, with unstained bacteria, cells and other small bodies 

 in general, the details of the pictures depend upon the difference in 



FIG. 35 



EYE-PIECE OR OCULAR. 



DRAW-TUBE WITH MM. SCALE. 



COARSE ADJU8TM. 



FINE ADJUSTM. 



OR 

 MM. SCREW. 



A modern student's and practitioner's microscope. 



refraction between the different parts of the bacteria (flagellse, 

 granules, spores, capsules, etc.) and the medium in which they are 



