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appear astronomical attraction Bentley Biot blue bodies calculus Cambridge cause centre colours Colsterworth comets Commercium communicated consequence considered contained curves dated death degree Descartes differential calculus direction discoveries distance doctrine earth edition experiment Flamstead force fringes Galileo genius glass gravity Halley heat Hipparchus honour Hooke Huygens infinite inquiries invention James Gregory John Newton Keill Kepler labours Leibnitz letter London manuscript mathematical ment method of fluxions mind moon motion nature never Newtonian philosophy object-glass observations Oldenburg opinion Optics orbit papers particles of light phenomena philosopher planets plate possession Principia principles prism produced published quadrature rays received reflecting telescope refrangibility remarkable Richard Newton Royal Society scholium seems Sir Isaac Newton space spectrum speculum stars supposed surface theory thickness thought tion tonian transmitted Trinity College truth Tycho views Whiston white light Woolsthorpe yellow
Página 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.
Página 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...
Página 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, yet next to the return of good offices, such as from a sincere good will I have ever done you, I receive your acknowledgment of the contrary as the kindest...
Página 301 - 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, while the great ocean of truth lay all undiscovered before me.
Página 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.
Página 211 - I am extremely troubled at the embroilment I am in, and have neither ate nor slept well this twelvemonth, nor have my former consistency of mind. I never designed to get anything by your interest, nor by King James's favour, but am now sensible that I must •withdraw from your acquaintance, and see neither you nor the rest of my friends any more, if I may but leave them quietly.
Página 248 - For understanding the prophecies, we are, in the first place, to acquaint ourselves with the figurative language of the prophets. This language is taken from the analogy between the world natural and an empire or kingdom considered as a world politic.
Página 150 - This principle is, that every particle of matter is attracted by, or gravitates to, every other particle of matter, with a force inversely proportional to the squares of their distances.
Página 48 - I doubt not but will prove much more grateful than the communication of that instrument, being in my judgment the oddest, if not the most considerable detection, which hath hitherto been made in the operations of nature.