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Wolverhampton Wanderers 3 vs
View of a guinea pig foetus and placenta
King Henry IV of England
towards two young ladies
Engraved by Thomas Hodgetts
Roundel for use in optical experiments Product:Postcard Wolverhampton Wanderers 3 vsPlate 9 figure 2 from the paper "New experiments on the ocular spectra of light and colours", by Robert Waring Darwin, Philosophical Transactions of the Royal Society, vol. 76 (1786), pp. 313 348. Roundel intended for use in exploring colour perception. In the written experiment circular pieces of silk are overlaid in the sequence blue (outer), yellow, pink, green and indigo (inner) with a central spot. "look steadily for a minute on this central
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