Of preparing and applying Objects. 57 
but Care taken to fort the Objedts according 
to their Size and Tranfparency; in fuch 
Manner that none he put together in the 
fame Slider, but what may properly be ex¬ 
amined by the fame Magnifier : and then 
the Slider fhould be marked with the Num¬ 
ber of the Magnifier its Objedts are fitted 
for; that is, the mod; transparent, or mi¬ 
nuted: Objedts of all, which require the fird 
Magnifier to view them by, fhould be pla¬ 
ced in a Slider, or Sliders, marked with Num¬ 
ber I.; thofe of the next Degree in Sliders 
marked with Number II. and fo of the red. 
This Method will fave Abundance of Time 
and Trouble in fhifting the Magnifiers, 
which, without fuch Sortment, mud perhaps 
be done two or three Times in overlooking 
a fingle Slider The Numbers, marked 
upon the Sliders will likewife prevent our be¬ 
ing at any Lofs what Glafs to apply to each. 
Small living Objedts, fuch as Lice, Fleas, 
Gnats, fmall Bugs, minute Spiders, Mites, 
&V. may be placed within thefe Talcs 
without killing or hurting them, if Care be 
taken not to prefs down the Brafs Rings 
that keep in the Talcs : and will remain 
* In placing your Objedts in Sliders, a convex Glafs of 
about an Inch Focus, to hold in the Hand, and thereby 
adjult them properly between the Talcs, before you fallen 
them down with the Brafs Rings, will be found very con<= 
yemento 
alive 
