42 SEIiECnON AND tTSE 



be reflected up through the stage when the objects to be ex- 

 amined are transparent; and when they are to be viewed by re- 

 flected light there is a dai'k ground of hard rubber (not shown 

 in the engraving) which is also carried by the stem, D, and 

 may be turned under the stage, so as to cut off all transmitted 

 light. Dissecting needles (K and L), with neat handles, fit 

 into appropriate grooves. When the lenses and stage are re- 

 moved from the stem they are readily packed in the case; the 



Fig. 10. THE EXCELSIOR MICROSCOPE. 



stem is then turned down and held in its groove by the button, 

 E; the lid is drawn out of the groove, turned over, and re- 

 placed so that the vertical piece (C) closes the open end of the 

 box, and the Avhole thing is packed into a compass which readily 

 admits of its being carried in the vest po. ket. 



The lenses are' well made, and being provided with a proper 

 diaphragm, great clearness of definition is secured. Two styles 



