ZOOLOGY AND BOTANY, MICROSCOPY, ETO. 
225 
Zeiss Stand Via. — Messrs. Zeiss have designed a stand which they 
consider particularly suitable as a small laboratory and travelling 
Microscope. 
The stand (fig. 26) is on the lines of their usual Microscopes. 
With respect to size and equipment it stands just midway between 
stands IV. and VI. The upper body of the instrument is inclinable 
as a whole and may be tilted into a horizontal position. The solid 
metal stage has a surface of 80 X 80 mm. (3f X 3 J in.). It is therefore 
large enough for the convenient manipulation of the usual forms of 
object-slides. Below the stage, in the axis of the Microscope, is fixed a 
sleeve into which any of the following interchangeable appliances may 
Fig. 27. Fig. 28. 
be inserted, viz. — the ordinary cylinder diaphragm (with three stops 
of different apertures) ; or the new form of iris cylinder diaphragm 
(fig. 27); or the illuminator No. 19 (fig. 28), of numerical aperture 1*0, 
with iris diaphragm centrally fixed in the lower focal plane of the con- 
denser. The illuminator suffices for bacteriological work with so-called 
“full illumination.” 
For central illumination, the aperture of 1 • 0 will be found sufficient 
for all purposes, but the condenser is not adapted for observation with 
oblique illumination. 
The light is reflected to the condenser by means of a plane and 
concave mirror of 36 mm. (If in. diam.), attached to an arm which is 
movable in all directions. 
The prism which forms the guiding element for the micrometer- 
movement or fine-adjustment, rises from the top of the stage. This 
micrometer-movement is, Messrs. Zeiss state, well adapted for work with 
the highest powers. 
The tube is not graduated, and when extended to its full length, has 
1895 Q 
