ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



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up to 210 mm. in diameter may be projected by simply placing them 

 on the condenser lens. The latter is let into the stage, and, when not 

 required, is covered by a sliding shield. From fig. 109 it will be seen 



Fig. 109. 



that the lamp is lowered for -this mode of projection. To do so it is 

 only necessary to loosen a clamping screw and to depress the handle 

 provided at the side of the vertical steel tubes. The motion of the lamp 



