34 HOW TO USE THE MICROSCOPE 



from the stage. The bull's-eye is placed with its 

 plane surface towards the flame, between it and the 

 object, and at such a distance that the latter is 



Fig. 11. — Bdll's-Eye Condenser. 



illuminated by a small image of light focussed 

 upon it. 

 It is usually stated that a large bull's-eye is better 



