“There are tories in science who regard imagination as a faculty to be avoided rather than employed. They observe its actions in weak vessels and are unduly impressed by its disasters” —John Tyndall, 1870
In his 1881 essay on Mental Imagery, Francis Galton noted that few Fellows of the Royal Society or members of the French Institute, when asked to do so, could imagine themselves sitting at the breakfast-table from which presumably they had only recently arisen. Members of the general public, women especially, fared much better, being able to conjure up vivid images of themselves enjoying their morning meal. From this Galton, an anthropologist, noted polymath, and eugenicist, concluded that learned men, bookish men, relying as they do on abstract thought, depend on mental images little, if at all.
In this rejection of the scientific role for the imagination Galton was in disagreement with Irish physicist John Tyndall who in a 1870 address to the British Association in Liverpool entitled The Scientific Use of the Imagination claimed that in explaining sensible phenomena, scientists habitually form mental images of that which is beyond the immediately sensible. "Newton’s passage from a falling apple to a falling moon”, Tyndall wrote, “was, at the outset, a leap of the prepared imagination.” The imagination, Tyndall claimed, is both the source of poetic genius and an instrument of discovery in science.
The role of the imagination is chemistry, is well enough known. In 1890 the German Chemical Society celebrated the discovery by Friedrich August Kekulé von Stradonitz of the structure of benzene, a ring-shaped aromatic hydrocarbon. At this meeting Kekulé related that the structure of benzene came to him as a reverie of a snake seizing its own tail (the ancient symbol called the Ouroboros).
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