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sOPECTACLES, &c.-The subscribers, Manufac-
~ turers Of Mathematical, Optical and Philosophi
cal Instruments, (at the solicitation of their friends
have added to their esablishmentlhe article Of Spec
taces, in every variety Of forms, where glasses Of
the best quality, and correctly ground on optical
principles may be had to suit the sight of (neary) all
persons gold frames made to ORDER of any pattern,
glasses fitted to old frames, and all work in the line
done in the best manner; where may be had great
variety of Mathematical. Drawing Instruments from
" to $50, Engineers and Surveyors Instruments of
superior quality, Pocket and other Telescopes supe-
rior Thermometers, in mahogany cases, for halls or
parlors, Barometers, sc. Shortly will be published
in pamphlet form with plates, an Essay on the Human
Eye, showing its defects, and explaining the applca
ton Of Optical Glasses, to its assistance &c.


PATTENa & SON.


South side Pennsylvania avenue,


nov 6--lm between 10th and | lth SITS