ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
683 
Zeiss’ Stands VI. and VII.* — SI 
has a fixed stage (63 X 70 ram.). r J 
tube, the fine by micrometer- screw. 
Stand VII. (fig. 102) is in all 
respects similar to Stand VI., except 
that it is not inclinable. It is sub- 
stantially built for laboratory use. 
Great care has been taken in 
the construction of the fine-adjust- 
ment of both these stands, so that 
they can be used with the highest 
dry powers, and even with immer- 
sion systems if particular care be 
taken. 
Zeiss’ Dissecting Stands.f — 
The Paul Mayer’s Dissecting Stand. 
I., shown in fig. 103, has a heavy 
horse-shoe foot, and a stage consist- 
ing of a large metal frame (10 X 
10 cm.), to which are attached 
wooden folding hand-rests. The 
adjustment is by rack and pinion. 
The dissecting system may be fixed 
in the ordinary lens-holder p, or in 
a suitable ring R on the movable 
arm L R, which is inserted into the 
ordinary lens-support at L. By 
this latter arrangement the whole 
of the stage can be scanned. 
Dissecting Stand III. (fig. 104) 
has a heavy square metal base, and 
large stage (75 x 60 mm.) with 
leather-covered hand-rests B. It is 
provided with different lens-holders, 
according to the lenses to be used. 
Dissecting Stand IV. (fig. 105) 
is constructed after the well-known 
former model of Zeiss. The coarse- 
adjustment is by sliding lens-holder, 
the fine-adjustment by micrometer- 
screw. 
Polarisation Microscope for 
the Examination of Butter 4 — Sig. 
C. Besana describes a new method 
of examining the purity of butter, 
which consists in smearing the 
butter on a selenite plate so orien- 
tated on the Microscope-stage be- 
tween crossed nicols as to give a 
reddish-violet field. Pure butter 
* Zeiss’ Catalogue, No. 30, 1895, pp. 
X Zeitschr. f. Angewandte IV 
VI. (fig. 101) is inclinable and 
coarse-adjustment is by sliding 
54-5. f Tom. cit., pp. 96-9. 
[ikroekopie, i. (1895) p. 53. 
