1687-88, Isaac Newton, Fundamentum Opticae : Considerabam praeterea quod latitudine foraminis F per quod lux in cubiculum ingreditur fit penumbra in circuitu spectri Y, et penumbra illa permanet in lateribus rectilineis spectrorum PT et pt. You will be obliged to explain it to me, when you return safe and sound, whether the ' spectre' of you is at my command, so as to occur to me as soon as I have taken the fancy to think about you and not only about you, who are in my heart's core, but supposing I begin thinking about the island of Britain - will its image fly at once into my mind?Ĭ.
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