Besides the _Nebulæ_, and new Stars, it appears from the ancient Catalogues of _Hevelius_, &c. that some of the old ones have intirely vanished; in particular, one in the left Thigh of _Aquarius_, the contiguous one preceding in the Tail of _Capricorn_; the second on the Belly of the Whale; the first of the unformed ones after the Scales of _Libra_, and several others. Many of the Stars also appear to be double, as the first Star of _Aries_ and _Castor_; others triple, as one in the _Pleiades_; and the middle one in _Orion's_ Sabre; and others again, quadruple, _&c._ I would now willingly help you to conceive the indefinite mutual Distance of the Stars, in order to give you some small Notion of the Immensity of Space; but as this will be a Task merely conjectural, I shall only desire you to believe it as far as your Reason will carry you, safely supported by an obvious Probability. Perhaps it may be necessary here to acquaint you, that all the Stars are so far apparently of different Magnitudes, that no two of them are to be found in the whole Heavens exactly the same, either in Bigness or Brightness[AH]. The largest we have sufficient Reason to believe is the nearest to us; the next in Bigness and Brightness more remote; and so on to the least we see, which we judge to be the most remote of all. The first Degree, or that of the largest Magnitude, we give to Syrius, the second to Arcturus, the third to Aldebaran, the fourth to Lyra, the fifth to Capella, the sixth to Regulus, the seventh to Rigel, the eighth to Fomahaunt, and the ninth to Antarus: These are all said to be of the first Class; and besides which, there are at least, within the Reach of our latest improved Opticks, nine more Denominations within the Radius of the visible Creation. [Footnote AH: A very little Knowledge in Opticks will render this indisputable, and has been in a great measure demonstrated before; 1. in the Great Dog; 2. in Bootes; 3. in the Bull; 4. in the Harp of _Apollo_; 5. in _Auriga_; 6. in the Lion; 7. in _Orion_; 8. in the Southern Fish; 9. at the End of _Erridanus_.]