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of the microscope. Every tree, every plant, every leaf, serves not only as an habitation, but as a world to some numerous race, till animal existence becomes so exceedingly refined, that the effluvia of a blade of grass would be food for thousands.

Since then no part of our earth is left unoccupied, why is it to be supposed that the immensity of space is a naked void, lying in eternal waste? There is room for millions of worlds as large or larger than ours, and each of them millions of miles apart from each other.

Having now arrived at this point, if we carry our ideas only one thought further, we shall see, perhaps, the true reason, at least a very good reason for our happiness, why the Creator, instead of making one immense world, extending over an immense quantity of space, has preferred dividing that quantity of matter into several distinct and separate worlds, which we call planets, of which our earth is one. But before I explain my ideas upon this subject, it is necessary (not for the sake of those that already know, but for those who do not) to show what the system of the universe is.

XIV System of the Universe

That part of the universe that is called the solar system (meaning the system of worlds to which our earth belongs, and of which Sol, or in English language, the Sun, is the center) consists, besides the Sun, of six distinct orbs, or planets, or worlds, besides the secondary bodies, called the satellites, or moons, of which our earth has one that attends her in her annual revolution round the Sun, in like manner as the other satellites or moons, attend the planets or worlds to which they severally belong, as may be seen by the assistance of the telescope.

The Sun is the center round which those six worlds or planets revolve at different distances therefrom, and in circles concentric to each other. Each world keeps constantly in nearly the same tract round the Sun, and continues at the same time turning round itself, in nearly an upright position, as a top turns round itself when it is spinning on the ground, and leans a little sideways.

It is this leaning of the earth (23½ degrees) that occasions summer and winter, and the different length of days and nights. If the earth turned round itself in a position perpendicular to the plane or level of the circle it moves in round the Sun, as a top turns round when it stands erect on the ground, the days and nights would be always of the same length, twelve hours day and twelve hours night, and the season would be uniformly the same throughout the year.

Every time that a planet (our earth for example) turns round itself, it makes what we call day and night; and every time it goes entirely round the Sun, it makes what we call a year, consequently our world turns three hundred and sixty-five times round itself, in going once round the Sun.36

The names that the ancients gave to those six worlds, and which are still called by the same names, are Mercury, Venus, this world that we call ours, Mars, Jupiter, and Saturn.37 They appear larger to the eye than the stars, being many million miles nearer to our earth than any of the stars are. The planet Venus is that which is called the evening star, and sometimes the morning star, as she happens to set after, or rise before the Sun, which in either case is never more than three hours.

The Sun as before said being the center, the planet or world nearest the Sun is Mercury; his distance from the Sun is thirty-four million miles, and he moves round in a circle always at that distance from the Sun, as a top may be supposed to spin round in the tract in which a horse goes in a mill. The second world is Venus; she is fifty-seven million miles distant from the Sun, and consequently moves round in a circle much greater than that of Mercury. The third world is this that we inhabit, and which is eighty-eight million miles distant from the Sun, and consequently moves round in a circle greater than that of Venus. The fourth world is Mars; he is distant from the sun one hundred and thirty-four million miles, and consequently moves round in a circle greater than that of our earth. The fifth is Jupiter; he is distant from the Sun five hundred and fifty-seven million miles, and consequently moves round in a circle greater than that of Mars. The sixth world is Saturn; he is distant from the Sun seven hundred and sixty-three million miles, and consequently moves round in a circle that surrounds the circles or orbits of all the other worlds or planets.

The space, therefore, in the air, or in the immensity of space, that our solar system takes up for the several worlds to perform their revolutions in round the Sun, is of the extent in a strait line of the whole diameter of the orbit or circle in which Saturn moves round the Sun, which being double his distance from the Sun, is fifteen hundred and twenty-six million miles; and its circular extent is nearly five thousand million; and its globical content is almost three thousand five hundred million times three thousand five hundred million square miles.38

But this, immense as it is, is only one system of worlds. Beyond this, at a vast distance into space, far beyond all power of calculation, are the stars called the fixed stars. They are called fixed, because they have no revolutionary motion, as the six worlds or planets have that I have been describing. Those fixed stars continue always at the same distance from each other, and always in the same place, as the Sun does in the center of our

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