ZOOLOGY AND BOTANY, MICROSCOPY, ETO. 
579 
the new stand is arranged for oculars of large field. The following 
table gives the diameters in millimetres of the objective field with the 
various oculars and objectives, from which it may be seen that the second 
ocular almost doubles the field of view. 
Objective, No 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
Ordinary ocular, No. 2 
3*8 
3*45 
2-25 
1-6 
1-35 
0-9 

0-7 
0-46 
0-33 
0-28 
Ocular No. 2 with in-1 
creased field . . . . J 
6-0 
5-5 
3-31 
2-5 
2-0 
1*5 
1-15 
0-7 
0*55 
0-4 
is 
Fig. 45. 
The graduated rotating stage reads with a vernier to 5'. 
Stand for the Examination of Large Sections.* — Herr E. Nebelthau 
describes an arrangement for facilitating the systematic examination of 
large sections under the Microscope. Large medical preparations can 
often not be conveniently handled on the ordinary stage. The stage 
bridged over by a plate, on which, 
by means of a screw, the Micro- 
scope-tube may be moved from left 
to right. The stage itself may be 
moved backwards and forwards by 
a screw under the bridge. By 
means of these two rectangular 
motions, any portion of the pre- 
paration may be brought into view, 
and orientated by scales on the 
upper plate and stage. The stage 
and bridge are supported on a 
frame in which are openings for the 
adjustment of the mirror. 
(3) Illuminating- and other 
Apparatus. 
Apparatus for Bacteriological 
Sampling of WelliWaters.j- — The 
apparatus devised by Prof. H. L. 
Bolley is best explained by the ac- 
companying sketch, and is made, 
except the glass and rubber parts, 
of brass. The body -piece R is 
9 in. long by 1J in. square. To 
one side of R is fitted the box U, 
attached by the hinge r, and so 
arranged as to close in the collect- 
ing tube T when ready for lowering 
into the water. The block is per- 
forated so as to allow the passage of the tube p directly through the 
centre of the body-piece. The tube also passes through a slot in the bar 
* Zeitschr. f. Instruments, xvii. (1897) pp. 252-3. See Zeitschr. f. wiss. Mikr., 
xiii. (1896) p. 417. 
t iCentralbl. Bakt. u. Par., l t0 Abt., xxii. (1897) pp. 288-90 (1 fig.). 
