44 THE MICROSCOPE. 



are crossed by others, and then these transverse strise 

 will be better seen by an illuminating pencil less 

 favourable for longitudinal, so that, in 

 order to bring them into distinct view, 

 either the illuminating pencil or the 

 object must be moved or rotated a 

 quarter round. 



Swinging Sul-stage, or Tailpiece. 

 The swinging sub- stage, although a 

 revival of an invention contrived by 

 Mr. T. Grubb some twenty years ago, 

 has been very generally adopted, since 

 it is thought by manufacturers to be an important and 



FIG. 27. 



