xxxvi The Microfcope explained. 
button d, the fteel fprings will then be fo feparated from 
the plate I, as to receive any other part of the apparattis 
and maybe there made fall by tightening the fcrewc. 
e, A nut, by the fcrewing of which the joint C may 
be tightened, if at any time it fliould wear eafy. 
The plate mark’d fig. 19. reprefents the apparatus be¬ 
longing to the univerfal fingle microfcope ; and alfo to 
the univerfal double microfcope, reprefented at fig. 20, 
Whereof, 
a, b, f. Is a contrivance to confine a fmall fifh, by put¬ 
ting its tail under a fpring on the infide at c, and tying 
the body of the fifh to the long part b, f, the two extreme 
ends of the tail may be drawn through the flits d, d, 
on each fide, that the middle of the tail may He flat : 
then put the end se of this fifh-pan between the object 
carrying plate I, and fprings b, of fig. 18, (they being 
firft opened to a proper thicknefs to receive it,) in 
fuch a manner, that the hole e, under which the tail 
of the fifh is placed, may lie nearly under the center 
of the hole f, in the objebt carrying plate I. In this po- 
fition, the circulation of the blood may be examined 
with eafe and pleafure. It may alfo be feen in the web 
between the toes of a frog’s hind foot, which is to be 
placed under the fpring at c, and its body tyed with a 
tape to the part b, f. 
R, is a piece of glafs to be placed as occafion requires, 
cither upon the furface of the objedt carrying plate I, or 
between it and the fprings b ; its ufe is to hold any ac¬ 
cidental objedt that may offer. 
S, S, a jointed Aider, containing two flat glafles, with 
cavities funk in them, defigned for confining any final! 
object without crufhing or deftroying it; and is alfo to- 
be placed between the objedf carrying plate I, and 
fprings b, which muff be fet wider to receive it as before 
di reded. 
