68 



LA BORA TOR Y MICROSCOPES 



\CH. II 



FIG 



FIGS. 67, 6ya. The removable mechanical stage of the Bausch & Lomb Opti- 

 cal Company. In the upper figure it is in position on the stage of the microscope ; 

 in the lower figure only the clamping part is in position, the rest having been 

 removed to leave the stage of the microscope free. 



