Book by Norman Lockyer

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Keely
"Norman Lockyer, in his 'Chemistry of the Sun,' writes: 'The law which connects radiation with absorption, and at once enables us to read the riddle set by the sun and stars, is, then, simply the law of sympathetic vibration.' This is the very cornerstone of Mr. Keely's philosophy." [Sympathetic Vibratory Force]

The Sun and Its Missing Colors
Image Credit: Nigel Sharp (NSF), FTS, NSO, KPNO, AURA, NSF

Explanation: Here are all the visible colors of the Sun, produced by passing the Sun's light through a prism-like device. The spectrum was created at the McMath-Pierce Solar Observatory and shows, first off, that although our white-appearing Sun emits light of nearly every color, it appears brightest in yellow-green light. The dark patches in the featured spectrum arise from gas at or above the Sun's surface absorbing sunlight emitted below. Since different types of gas absorb different colors of light, it is possible to determine what gasses compose the Sun. Helium, for example, was first discovered in 1870 on a solar spectrum and only later found here on Earth. Today, the majority of spectral absorption lines have been identified - but not all. [NASA]