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appear attraction believe blue bodies Cambridge cause centre colours communicated consequence considered contained continued curves dated death determine direction discovered discoveries distance doctrine doubt earth East Lothian equal experiment explain express fact force give given glass gravity heat Hooke important inquiries invention labours Leibnitz letter light London manuscript mathematical matter means method mind moon motion nature never object observations obtained opinion Optics orbit original particles pass person philosopher planets plate possessed present Principia principles prism produced published rays reason received referred reflected refraction relation remarkable respecting Royal Society says seems seen Sir Isaac Newton space spectrum supposed surface telescope theory thing thought tion transmitted true truth views writings written yellow
Pàgina 300 - I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Pàgina 139 - I only hint at present to such as have ability and opportunity of prosecuting this inquiry, and are not wanting of industry for observing and calculating, wishing heartily such may be found, having myself many other things in hand, which I would first complete, and therefore cannot so well attend it. But this I...
Pàgina 78 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
Pàgina 217 - I could not have believed what you tell me of yourself, had I had it from any body else. And though I cannot but be mightily troubled that you should have had so many wrong and unjust thoughts of me...
Pàgina 149 - The third I now design to suppress. Philosophy is such an impertinently litigious lady, that a man had as good be engaged in lawsuits, as have to do with her.
Pàgina 216 - I desire you to forgive me this uncharitableness. For I am now satisfied that what you have done is just, and I beg your pardon for my having hard thoughts of you for it, and for representing that you struck at the root of morality, in a principle you laid down in your book of ideas, and designed to pursue in another book, and that I took you for a Hobbist.
Pàgina 149 - I must again beg you," says he, "not to let your resentments run so "high as to deprive us of your third book, wherein your applications of your mathematical doctrine to the theory of comets, and several curious experiments, which, as I guess by what you write ought to compose it, will undoubtedly render it acceptable to those who will call themselves philosophers without mathematics, which are much the greater number.
Pàgina 256 - WHEN I wrote my treatise about our system, I had an eye upon such principles as might work with considering men for the belief of a Deity ; and nothing can rejoice me more than to find it useful for that purpose.
Pàgina 320 - I WAS on Sunday night, the 7th of March, 1724-5, at Kensington with Sir Isaac Newton, in his lodgings, just after he was come out of a fit of the gout, which he had had in both his feet, for the first time, in the eighty-third year of his age. He was better after it, and his head clearer, and memory stronger than I had known them for some time.
Pàgina 282 - I found that, as often as I went into the dark, and intended my mind upon them, as when a man looks earnestly to see anything which is difficult to be seen, I could make the phantasm return without looking any more upon the sun; and the oftener I made it return, the more easily I could make it return again.