(g hard). So called from Louis Galvani, of Bologna.
Signora Galvani in 1790 had frog-soup prescribed for her diet, and one
day some skinned frogs which happened to be placed near an electric
machine in motion exhibited signs of vitality. This strange phenomenon
excited the curiosity of the experimenter, who subsequently noticed
that similar convulsive effects were produced when the copper hooks on
which the frogs were strung were suspended on the iron hook of the
larder. Experiments being carefully conducted, soon led to the
discovery of this important science.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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