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PREFACE.

TH

HE quick Sale of the first Impreffion of this Work, is a fatisfactory Proof of its Utility to the Public; and the urgent Demand for it, which ftill continues, is the Reafon of this Second Edition. The Errors of the first have been carefully corrected, as well of the Plates as of the Letter-Prefs, There is also added a Table of Contents; and a copious Index to each Volume. Some Paffages have been altered for the better; but no confiderable Additions have been made, in Juftice to the former Purchasers. The principal Improvements I have made in thefe Subjects fince their firft Publication, have been in a New ORRERY, MICROSCOPE, and CLOCK; the Orrery and Clock I have already published the Description and Ufe of, with a Copper-Plate Print of each; alfo a fhort Sketch of the Microscope, under the Title of the Polydynamic MICROSCOPE,

because

because to cach Object Lens there are given, by this new Conftruction, feveral different magnifying Powers. I propofe to give a further Account of this Microfcope, and a great many curious Copper-Plates of Microfcopic Objects, which, together with the above-、 mentioned Pieces, and my Optical Effays, will make a Third Volume, that may be properly confidered as fupplemental to the Gentleman and Lady's PHILOSOPHY; and will probably be the laft Effort I may ever make of rendering my Lucubrations (in this Way) ferviceable to the Public.

THE

KING,

THE

Young Gentleman and Lady's PHILOSOPHY,

IN A

Continued SURVEY of the WORKS of NATURE and ART,

Published,

By his ROYAL PERMISSION,

Under His Moft Gracious and Aufpicious

PATRONAGE,

Is now, with all Humility,

Infcribed,

By his MAJESTY'S

Moft Loyal,

Dutiful, and Obedient

Subject and Servant,

BENJ. MARTIN.

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