268 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
of our Microscope, tlie question is bow to utilize it for tbe manipulation 
of slides. Here there is abundant scope for invention and adaptation to 
tbe different requirements of tbe microscopist. 
Tbe jnetliod bere employed of attaching tbe slides to tbe piece b is 
by means of a bar, which we call tbe “ arm ” d. Tbe arm passes through 
tbe bead of a short stout pin c. This pin can be placed in one of three 
boles in b, according to tbe requirements of the objects to be studied. 
In order to prevent c from rotating in its socket a cross-bar passes 
through it, and lies in the groove seen in tbe figure to connect tbe boles 
in b. Tbe arm d thus remains rigidly parallel with tbe plate a, and the 
movement of tbe pinions 1 and 2 will clearly carry anything attached to 
the proximal end of tbe arm freely across the stage of tbe Microscope 
in any direction. In order to give still further range, tbe arm is made 
to slide through tbe bead of tbe pin, and tbe latter itself can be placed 
in any one of tbe three boles in b. 
There are two methods of enabling tbe arm to move slides, each of 
which has its advantages. 
If it is especially desired that tbe slide should lie flat upon tbe 
Microscope-stage, then it is perhaps best clipped by an arrangement 
such as that shown 
Fio. 32. in fig. 32, where tbe 
small arm K slides up 
and down, so as to 
take slides of almost 
any width (4£ cm. in 
the one figured). Tbe 
tip of K is provided 
with a piece of india- 
rubber tubing, which 
prevents slides from 
escaping when tbe 
clip is drawn from left 
to right. 
Another plan is 
that shown in fig. 31, 
where tbe slides rest 
on a light frame e. 
Tbe clamp m slides backwards and forwards so as to be adaptable to 
any size of slide, trough, &c. 
These clips and frames are clearly tbe least expensive parts of tbe 
whole mechanism, and the microscopist can have several, of the sizes 
which experience teaches him are most useful for his special require- 
ments. 
It is obvious that instead of d carrying a frame or clip the end of 
the arm might be provided with forceps, and in this case the pin might 
be modified into a ball-and-socket arrangement for the moving of these 
forceps; we should then have the usual stage-forceps with, however, 
movements of much greater range. 
The new stage as figured here is not made to rotate. There is, 
however, no mechanical difficulty in the way of making such stages to 
revolve. In order to attain this the piece n, with its corresponding 
