[ 3 3 
T H E 
INTRODUCTION. 
A MONG the various Branches of Phi* 
lofophy, the Science of Opticks, feems 
for fome years paft to have been one 
of the favourite Entertainments of the Learn¬ 
ed : The Phasnomena of this Curious part of 
mixt Mathematicks, affords us a moll no¬ 
ble Difplay of the Works of Nature. 
During the laft and prefent Century, every 
Artift has met with a moft favourable Recep¬ 
tion, who has attempted the Improvement of 
any Inftrument tending to the advancement of 
Agronomical, or other Optical Difcoveries; 
and as few are fo perfect, as not to admit of 
confiderable Amendments, our firft Endeavour 
was fome time ago to remedy fome Imperfec¬ 
tions we obferved in the Refracting Te- 
A 2 LESCOPE, 
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