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The slide should pass easily under the clips- 

 which however, is not the case when the edge of 

 the clips are too bluntly rounded and when the 

 springs are too stiff. In either case the clips may 

 be bent so that the slide will work easily. Some 

 persons prefer to work without clips, but this can 

 only be done after considerable experience has 

 been acquired and only when the instrument is in 

 an upright position. 



With the low power objectives, which are used 

 on coarse and usually large objects, it will be 

 found after properly focusing, that a portion of 

 the object will show itself in the field and by mov- 

 ing it, can easily be brought to the center. In 

 this connection it must be remembered that the 

 image in the eyepiece is in a reversed position 

 from that of the object and that a movement of 

 the object to the left gives an apparent movement 

 to the right in the field. This will create some- 

 confusion at the outset, but after a little practice 

 the movement becomes involuntary. In the case 

 of a small object which is not found after the 

 objective is known to be in focus and which is 

 easily recognized by the mounting medium or 

 small particles of dust on the cover glass, move 

 the slide about on the stage by grasping one end 

 with the thumb and forefinger, when it can usually 

 be recognized by the shadowy outlines of the 

 object as it flits across the field. The difficulty of 



