ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



109 



tially of a Microscope mounted on an adjustable pillar (fig. 4), the Micro- 

 scope being of tbe compound type, with ocular and combination objective, 

 giving focal distances of 5, 9, and 48 cm. It bas rack-and-pinion adjust- 

 ment for focus, also for vertical adjustment, in addition to a sliding 

 adjustment for tbe same purpose, botb tbe latter being graduated. 

 T.^. Tbe pillar is mounted on a base witb levelling screws, botb base and 

 Microscope being provided witb spirit-levels. 



Fig. 3. 



Leitz Nebelthau's Sliding Microscope. — Tbis instrument (fig. 5), 

 although originally designed for looking over large brain sections, will 

 perhaps find its chief use in the bacteriological laboratory for tbe ex- 

 amination of culture plates. For tbis purpose its unique stage-plate 

 would be particularly serviceable ; it measures 16 by 20 cm., practically 

 every part of which can be brought under examination by the mechanical 

 movement of either Microscope or stage, the necessary illumination beino- 

 obtained by means of a long rectangular mirror. 



The compound Microscope figured can be detached, and a simple lens, 



