24 APPLIED BACTERIOLOGY FOR NURSES 



value, in that it often helps to differentiate bacteria 

 from one another. This will be seen when we study 

 Gram's stain and the stain for tubercle bacilh (p. 26). 



Demonstration. — Show a reading glass, and a high-power magni- 

 f>dng glass such as is used to count threads in a woven fabric. 

 (Image erect.) 



Demonstrate the compound microscope. (Image inverted.) 



