( 12-41 } 
ML The Defcript'mi and manner of Ufmg a late Invent^ 
ed Set of fmall ^ocket^Microf copes ^ made by James 
Wilfon ; tphkh with great eafe are apply din Viewing 
Opal^e^ Tranfparent and Liquid Ohje&s : as the Fari- 
^nx of the Flowers of TlantSy &cc. The Circulation of 
the ^lood in LiVnig Creatures^ 3cc. The Animal- 
cula in SeminC;, &c. 
^T^He life of Microfcopes is fo v/ell known, that its as 
,|| needlefs to attempt their Recommendation to the In- 
quifitive, as it would be tedious to numerate their particu- . 
lar advantages in Natural Inquiries. No one whci looks 
into the Intimate ftrufture of the regular Produftions of 
Nature, but muft readily coniefs our Eyes ftand in great 
need of thefe Magnifying Opticks : Nor is it a little enter- 
taining to find the excellent Mechanifm and Beauty of Na- 
tural Objefts appear more Finifhed^ by how fliuch Thej are 
Magnified with good Microfcopes : On the other hand, 
what confufion muft it be to m ltheifi ( if there can be 
fuch an one ) to fee the moft Celebrated pieces of Art ap- 
pear Courfe, Deform'd, and altogether more Unfiniftied, 
by how much they are magnify 'd. 
The late Improvements rpade by Magnifying GUpsMo 
not fo much owing to the Making Them and Compofing 
Microfcopes, as the Methods of applying Objefts for the 
advantage of Light: 3 in which I hope the following .de- 
£cnhQArInflrHments will not be found inferiour to any yet 
made^ at leaft commonly fold. Experience, as well as the 
Authority of the Excellent f Dr IJ?^-^, aifures us, That f "^s/j /»r^ 
Single Magnifying Glaffes (when they can be ufed) arepre-^^^?^**^^* 
ferrable to Microfcopes^ compofed of two or more Magni-ifJ""^^'^* 
, • - Ffffffff f)ing. 
