Since this Information, there were, upon occasion given from thence, upon the same subject, further communicated from _Paris_ the following Particulars. I see by two of the Letters, that you incline to believe, the Glasses of _Maginus_ and _Septalius_ do approach to that of _Lyons_: But I can assure you, they come very far short of it. You may consult _Maginus_ his Book, where he describes his; and there are some persons here that have seen one of his best, which had but about twenty Inches Diameter; so that this of _Lyons_ must perform at least twice as much. As to _Septalius_, we expect the Relations of it from Intelligent and Impartial men. It cannot well be compared to that of _Lyons_: but in bigness; and in this case, if it have five _Palms_ (as you say) that would be about 31/2 feet _French_, and so it were a Foot bigger, which would make it half as much greater in surface: But as to the Effects, seeing it burns so far off, they cannot be very violent. And I have heard one say, that had seen it, that it did not set Wood on Fire but after the time of saying a _Miserere_. You may judge of the difference of the Effects, since that of _Lyons_ gathers its Beams together within the space of seven or eight _Lines_; {98} and that of _Septalius_ must scatter them in the compass of three Inches. Some here do intend to make of them yea and bigger ones; but we must stay till they be done, &c. * * * * * Of _Monsieur _Hevelius_'s Promise of imparting to the World his Invention of making _Optick Glasses_; and of the hopes given by Monsieur _Hugens_ of _Zulichem_, to perform something of the like nature; as also of the Expectations, conceived of some Ingenious Persons in _England_ to improve_ Telescopes. That eminent Astronomer of _Dantzick_, Monsieur _Hevelius_, writes to his Correspondent in _London_, as followeth: What hath been done in the grinding of Optick-glasses in your parts, and how those beginnings, mentioned by you formerly, do continue and succeed, I very much covet to hear, 'Tis now above Ten Years, since I my self invented a peculiar way of grinding such Glasses, and reduced it also into practice; by which 'tis easie, without any considerable danger of failing, to make and polish Optick-glasses of any _Conick_ Section, and that (which is most notable) in any dish of any Section of a _Sphere_: which Invention I have as yet discovered to none, my purpose being, for the Improvement of Natural Knowledge, to describe the whole method thereof in my _Celestial Machine_, and to propose it to the Examination and Judgment of the _Royal Society_; not doubting at all, but they will find the way true and practicable, my self having already made several Glasses by it, which many Learned Men have seen and tryed.