The Double RefleBing Micro/cope. 19 
TheBrafsFifh-panY.is to fatten a Smelt, 
Gudgeon, or any fuch fmall Fifh upon, to 
fee the Blood circulate in its Tail. For 
which Purpofe, the Tail of the Fifh mutt 
be fpread acrofs the oblong Hole at the 
fmalleft End of the Pan : then, by flipping 
the Button on the Backfide of the Pan into 
the Slit P. through the circular Plate L. the 
Spring that comes from the B u tton will make 
it tteady, and prefent it well to View. 
But if it be a Frog, a Newt, or Eel, in 
which the Circulation isdefired to be fhewn, 
a Glafs Tube 1. is fitted for the Purpofe. 
The Tail of a Newt, or Eel, or, in a Frog, 
the Web between the Toes of the Hind- 
Feet, are the Parts where it may be feen 
beft. When the Objedt is well expanded on 
the Infide of the Tube, Aide the Tube along 
under the circular Brafs Plate L. (where 
there are two Springs and a Cavity made in 
the Shank to hold it) and bring your Ob¬ 
ject diredtly under the Magnifier. 
There are three of thefe Glafs Tubes, 
finaller one than another, and the Size of 
the Objedl mutt diredt which to ufe; but in 
general, the lefs Room the Creature has to 
move about in, the eafier it may be ma¬ 
naged, and the quieter it will lie tp be 
managed. 
The Cell 2. with a concave and a plain 
Glafs in it, is intended to confine Fleas, 
Lice, Mites, or any fmall living Objedts, 
C 2 during 
