By W. DER HAM, Canon of Windfor, The ELEVENTH EDITION. GLASGOW: Printed for ROBERT URIE. MDCCL XV I I I. GEORGE, Prince of WALES, Prince Electoral of Brunswick-Lunenburg, etc. Duke of Cornwall and Rothfay, Duke and Marquis of Cambridge, Earl of Chester, MilfordHaven, and Carreck, Viscount North-Allerton, Baron of Tewksbury and Renfrew, Lord of the lands, and Steward of Scotland, and Knight of the most noble Order of the Garter. GREAT SIR, Y OUR ROYAL HIGHNESS having done me fo great an honour as to take this Book under your patronage, with great humility and thankfulness I lay it at your feet; not doubting but that (whatever my performance is) the fubject will be acceptable, it being a vindication of the Existence and Attributes of that infinite BEING, to whom your Royal Highness hath no less piously than juftly afcribed your great Royal Father's and your family's peaceable acceffion to the crown, and dignity of these realms. THAT the Bleffings of the fame most merciful BEING may be perpetuated to your Royal Highness, and all yours, is the hearty Prayer of, Moft Illuftrious SIR, Your Royal Highness's most humble obedient Servant, W. DERHAM. N Otwithstanding, that a book is more compleat and valuable by additions and amendments, yet, I think, that many and great additions are an hardship and injustice to the purchasers of a former edition; and therefore I have in this, and the foregoing editions, avoided it as much as well I could, although fome of my learned friends would have perfuaded me to it, and alfo contribut ed their obfervations. But yet from what I have faid in the Preliminary Dife. p. iii. it will, I doubt not, be expected, that I fhould give fome account of the observations, which the long and good glaffes in my hands have afforded me fince the last edition of this book. But I have little to boast of here, having (befides the old former complaint of the want of a long pole to manage Mr. Huygens's glass with) many great hindrances in my obfervations, partly by a very dangerous |