of those, commonly reckon’d, of the first, second, third, fourth, fifth, and sixth Magnitude; so that should they be distinguish’d thereby, those six Magnitudes would, at least, afford no less then thrice that number of Magnitudes, plainly enough distinguishable by their Magnitude, and brightness; so that a good twelve foot Glass would afford us no less then twenty five several Magnitudes.  Nor are these all, but a longer Glass does yet further, both more nicely distinguish the Magnitudes of those already noted, and also discover several other of smaller Magnitudes, not discernable by the twelve foot Glass:  Thus have I been able, with a good thirty six foot Glass, to discover many more Stars in the Pleiades then are here delineated, and those of three or four distinct Magnitudes less then any of those spots of the fourteenth Magnitude.  And by the twinkling of divers other places of this Asterisme, when the Sky was very clear, I am apt to think, that with longer Glasses, or such as would bear a bigger aperture, there might be discovered multitudes of other small Stars, yet inconspicuous.  And indeed, for the discovery of small Stars, the bigger the aperture be, the better adapted is the Glass; for though perhaps it does make the several specks more radiant, and glaring, yet by that means, uniting more Rays very near to one point, it does make many of those radiant points conspicuous, which, by putting on a less aperture, may be found to vanish; and therefore, both for the discovery of the fixt Star, and for finding the Satellites of Jupiter, before it be out of the day, or twilight, I alwayes leave the Object-glass as clear without any aperture as I can, and have thereby been able to discover the Satellites a long while before; I was able to discern them, when the smaller apertures were put on; and at other times, to see multitudes of other smaller Stars, which a smaller aperture makes to disappear.

In that notable Asterism also of the Sword of Orion, where the ingenious Monsieur Hugens van Zulichem has discovered only three little Stars in a cluster, I have with a thirty six foot Glass, without any aperture (the breadth of the Glass being about some three inches and a half) discover’d five, and the twinkling of divers others up and down in divers parts of that small milky Cloud.

So that ’tis not unlikely, but that the meliorating of Telescopes will afford as great a variety of new Discoveries in the Heavens, as better Microscopes would among small terrestrial Bodies, and both would give us infinite cause, more and more to admire the omnipotence of the Creator.

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Observ.  LX. Of the Moon_._