ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



419 



will be found very steady when placed in a horizontal position. The 

 mechanical stage is built on the Microscope, is very rigid and has a range 

 of 25 mm. in a vertical, and 60 mm. in a horizontal direction, both 

 graduated to h mm. The mechanism of the latter movement can, if 

 desired, be removed, leaving a large square stage 3| by 3 J in., on which 

 large sections or the contents of a Petri dish can be examined. 



The instrument is mounted on a tripod claw-foot, and is provided 

 with a universal substage having diagonal rack-and-pinion focusing 

 adjustment. Plane and concave mirrors of 50 mm. in diam., mounted 

 in gimbals, are carried on a tail-piece with universal movements. 



Zeiss Simplified Binocular Stand XB.* — This Microscope (fig. 56) 

 consists of a heavy foot with upright pillar, sliding cross-piece, and 



^c:ZEISS>3ENA^ 



Fig. 56. 



horizontal sliding-rod. The latter is fitted on one end with a clamping- 

 arrangement to take the binocular body-tube. The stand is primarily de- 

 signed for the preparation of large specimens, and is excellently adapted 

 for pond-life study, for observation of portions of large botanical or 

 mineralogical objects, etc. 



* Zeiss Catalogue, "Micro 261," 1913, p. 19, fig. 10. 



