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this Hypothesis was far from solving the Appearances of the heavenly Motions, and therefore is deservedly thus censured by the aforesaid Gentleman.

Firf Ptolomy his Scheme celestial wrought,
And of Machines a wild Provision brought.
Orbits centric and eccentric he prepares,
Cycles and Epicycles, folid Spheres,
In Order placed, and with bright Globes inlaid,
To solve the Tours by heavenly Bodies made.
But fo perplex'd, so intricate a Frame,

The later Ages with Derifron name. This System you have represented in the Diagram I have drawn for you (Plate I. Fig. 1.) and is evident by Inspection only. · Euphrol. It is fo ; it is the Figure of the Heavens, which I have seen in every cominon Map. But since Tycho disapproved of Ptolomy's System, I suppose he advanced one more plausible; pray, what was peculiar to his?

Cleon. 'Tis said, he placed the Earth in the Center of the System, and gave it only a diurnal Motion about its Axis once in 24 Hours ; tho’ some say, he made the Earth to be absolutely at rest, About the Earth he revolved the Moon, and also the Sun, but then about the Sun he placed the Orbs of Mercury, Venus, Mars, Yupiter and Saturn; so that they revolve at the same Time about the Earth once in a Year. Thus Sir Richard: .

The famous Dane, who oft the Moderns guides,
To Earth and Sun their Provinces divides;
The Earth's Rotation makes the Night and Day;
The Sun, revolving thro' the ecliptic Way,
Effects the various Seasons of the Year :

Which, in their Turn, for happy Ends appear.
This enormous Construction of a System of the World
I have represented also in a Scheme, for your more easy
apprehending it (Fig. 2.)

Eupbrof. I am obliged to you for it, as it is not quite fo ealy to get an Idea of it without. This Scheme of the Heavens, if I remember right, is also exploded; but I forget the particular Reasons thereof,

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Cleon. Because in this, not only fingle Planets, but a whole System is made to revolve about the Earth every Year; which is an Effect so prodigious to answer an End much easier brought about by a more simple and natural Contrivance, that it has been justly rejected by the Moderns, who all agree to admit the Copernican System as the only true and genuine one, of which we will hereafter discourse more particularly."

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DIALOGUE III. Of tbe fallacious Reasoning on which the PTOLO

MAIC HYPOTHESIS depends.

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Cleonicus. WIE last Night had a pleasant Walk, in which I

gave you a general Account of the Ptolomaic and Tyconic Systems; and as this Evening is like to prove very serene, if it be agreeable to you to take a Walk (after Tea) to the Villa beyond the Park, we will re-assume the Subject of the Ptolomaic System, and consider a little more nicely the Merits of it.

Eúpbrof. With all my Heart, Cleonicus; and I should be glad to know the particular Reasons why this System comes into such Discredit among the Learned, when it seenis, for the most part, agreeable to the Senses, and is often mentioned in the Holy Scriptures.

Cleon. Neither of those Arguments you now mention, my Euphrofyne, have an; Weight with Gentlemen of Learning, nor yet with Ladies of good Sense; and you'll find yourself able, with a little Reflection, to fee they are not only absurd, but even ridiculous ; for yoų may as well think every Thing true you hear, as that every Thing is just as you see it.

Euphrof. If we are not to believe our Şenses, Cleonicus, pray, why were they given us, and by what are we to be informed ?

Cleon. Our Senses are the general Means of Informa. fion, but they are all deceptive in fome Measure; none more

Reaford of fuche cause it apporter, where an oppopie

so than the Sight. My dear Euphrofyne, you will find it a dangerous Thing to trust your Eye-sight too far; our rational and discerning Faculties were given us for re&tifying the Ideas of Senses, and to discover Truth from Error. And herein consists our Pre-eminence above Brutes. But to come nearer the Point. To suppose the Earth at Rest, only because it appears to be fo, is the weakest Thing a Person can be capable of that pretends to any Reason at all. - Euphrof. Why, Cleonicus, you seem very serious, and almost warm ; if People are deceived by their Senses, and imposed upon by their Professors, how can they help it ?

Cleon. Very easily, my Euphrosyne, let them think and reason, and they will not be any longer the Dupes of Error and Imposture. A common Sailor, who has little Reason enough in most of his Actions, would yet be ashamed of such an Absurdity, as to conclude his Ship was at Rest, because it appears to be so to every one within it. And therefore, Sister, when you are disposed to take a Voyage to France, you will have an opportunity of being convinced that Bodies in Motion will appear to be at Rest, and Objects at Rest appear to move, and so you will have no farther Difficulty in that Affair.

Euphrof. Dear Cleonicus, I hope you will find some more agreeable Way to convince me, than by sending me to Sea; for though I Mould like to make the Tour of France, and to acquire philosophical Experience in the Voyage, yet I cannot, by any Means, think of the terrible Element of the Ocean.

Cleon. Well, though it might answer a very good Pura pose for you to see Paris, especially as you might then convince the Madames, that the English Ladies excel them as much in Genius and Faculties of the Mind, as They do them in the Frippery of Dress, and personal Decorations: Yet, to save you all this Trouble, we need only take a Walk to yonder Hill, and our Purpose will be answered every whit as well. . Euphrof. Indeed! Cleonicus; I Thall gladly chuse that Me. thod rather than the other ; but, pray, what curious Spectacle will there offer to confute such a general Argument?

Cleon. Come with me, and you will soon see, my Euphrofyne :-You observe a Wind-mill is there placed on an

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