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 found could be combined with chlorine, bromine, iodine, sulphur, ammonium, and other substances, always retaining its own individuality. It was, in fact, a compound radical, and though it has never been isolated, its compounds prove its character. Berzelius was so struck by this discovery that he suggested the name of proine or orthrine, either meaning the dawn, in substitution for benzoyl.

(From the Royal Collection of Etchings at Munich.)

Born at Eschersheim, near Frankfort, 1800; died at Göttingen, 1882. Wöhler's notable discovery of the artificial production of urea in 1828 is famous as the starting point of synthetic chemistry.

Henceforward discoveries and theories based on them,