8 



MICROSCOPE AND ACCESSORIES. 



[CH. I. 



present a mirror, or both a mirror and some form of condenser or illuminator for 

 lighting the object. The stand of the microscope consists of certain mechanical 

 arrangements for holding the optical parts and for the more satisfactory use of 

 them. (See frontispiece). 



Fig. 19. Lens Holder with adjustments for focusing and for turning the lens in 

 any direction. This is especially useftil in dissecting the minute parts of animals 

 too large for the regular dissecting microscope {Fig. 20). {Bausch & Lomb Opt. Co.). 



