Underneath his sweetness and gentleness was the heat of a volcano. [Michael Faraday] was a man of excitable and fiery nature; but through high self-discipline he had converted the fire into a central glow and motive power of life, instead of permitting it to waste itself in useless passion.
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About John Tyndall, Faraday as a Discoverer
John Tyndall, Faraday as a Discoverer.