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Account Æquinoctial Angle Animals Apogee appear Arteries Atmosphere Barometer Blood Body Cause Colours consequently considerable Degrees Descent Diameter distance Earth East Easterly Ecchoing Elevation equal Equation Experiment fall fame Fermentation Fluid Ftus Force Glass Globe Grains Gravity greater greatest Halley hath Heart Heat Horizontal Hyde-Park Hyperbola Inch of Mercury Inches infinite Intercostal Muscles Isaac Newton Juices Latitude Lens less Light likewise Line Magnetical manner ment Mercury Meridian minutes Monsoons Moon Moon's Motion Natural Philosophy Nature Needle Object observ'd Observations Ocean Oil of Vitriol Optick Parabola Perpendicular Placenta Plants Point Pole Prism proportion Quantity Rays Reason Refraction Refrangibility Saliva seme shew Sine Sound South Space subducted Sun's suppose Surface Syzygys Terrestrial Matter thence ther thereof thing Tides tion twill Umbilical Vein Uterus Vapours Variation Vegetable Velocity Water weight whence whereby wherein whole Winds
Page 110 - That the colours of all natural bodies have no other origin than this, that they are variously qualified, to reflect one sort of light in greater plenty than another. And this I have experimented in a dark room, by illuminating those bodies with uncompounded light of divers colours. For by that means any body may be made to appear of any colour. They have there no appropriate colour, but ever appear of the colour of the light cast upon them, but yet with this difference, that they are most brisk...
Page 288 - On this depends the Valuation of Annuities upon Lives ; for it is plain that the Purchaser ought to pay for only such a part of the value of the Annuity, as he has Chances that he is living ; and this ought to be computed yearly, and the Sum of all those yearly Values being added together, will amount to the value of the Annuity for the Life of the Person proposed.
Page 97 - SIR. To perform my late promise to you, I shall without further ceremony acquaint you, that in the beginning of the Year 1666 (at which time I applyed my self to the grinding of Optick glasses of other figures than Spherical.) I procured me a Triangular glass-Prisme, to try therewith the celebrated Phaenomena of Colours.
Page 97 - I placed my prism at its entrance, that it might be thereby refracted to the opposite wall. It was at first a very pleasing divertisement, to view the vivid and intense colours produced thereby ; but after a while applying...
Page 101 - For, a circular as well as a progressive motion being communicated to it by that stroke, its parts on that side where the motions conspire, must press and beat the contiguous air more violently than on the other, and there excite a reluctancy and reaction of the air proportionably greater.
Page 106 - twixt colours, and refrangibility, is very precise and strict; the Rays always either exactly agreeing in both, or proportionally disagreeing in both. 3. The species of colour, and degree of Refrangibility proper to any particular sort of Rays, is not mutable by Refraction, nor by Reflection from natural bodies, nor by any other cause, that I could yet observe.
Page 71 - In some places the time of the change is attended with calms, in others with variable winds. And it often happens on the...
Page 105 - tis generally believed), but Original and connate properties, which in divers Rays are divers.
Page 107 - ... and yellow powders, when finely mixed, appear to the naked eye, green, and yet the colours of the component corpuscles are not thereby really transmuted, but only blended.