ft £\ 
[ 654 ] 
Explanation of the figures /» TAB. I. referred to, 
in the foregoing Eager. 
1 ** r, ‘ 1 r ; ' *J . i‘ V*T i •' 
The 4th figure in Tab. I. reprefents the neceffary appa- 
ratus, for obferving commodioufly and regularly a 
cluftering Tolypus with the microfcope. In the 
glafs is the end of a peacock's feather b,c,f, bent 
at c , and w.hofe extremities are by the fpring of 
the feather, kept clofe againft the Tides of the 
glafs. At one of the ends/of the feather one of 
its beards is left on, which is long enough to 
fatten to it in m a flip of water horfetail dl, upon 
which is a ‘Polypus, which is by this means kept 
fo clofe to the fide of the glafs, as to be within 
the reach of a magnifyer of a fhort focus, fuch as 
e. This magnifyer is fcrewed on to a ring whofe 
arm ng has at its extremity g a ball playing in a 
focket fo as to make a joynt ; there are again, 
other like joynts at h and i, and by the help of 
thefe the magnifyer may be moved every way, 
and be conveniently brought near to the object. 
The foot ik is ttuck into the board upon which 
the glafs is placed. The light of a window in 
the day-time is fufficient to obferve an objed fo 
placed within the glafs, either, with the bare eye, 
or with an hand-magnifyer : but if a magnifyer 
of ,a fhort focus is neceffary, the (hatters mutt be 
clofed, and a wax light mutt be placed behind the 
glafs, at fuch a height as to have its light fall di- 
redfly upon the objed; and a magnifyer fo placed 
may remain if there is occafion for feveral days 
in the fame pofture without any inconvenience. 
Th<? 
