Autograph Letter Signed to Thomas Archer. [Humphry Davy].

English chemist (1788-1866) who succeeded Sir Humphrey Davy as Professor of Chemistry at the Royal Institution (1813). Two pages, octavo. Very good, though lightly creased and with remains of previous mount adhering to one edge. Begins 'I have no doubt that much fraud is committed by the substitution of spiritious liquors of different strengths, for what is called woodspirit and wood naphtha'. Ends 'I do not know what your knowledge of practical chemistry may be, but I think that a few comparative experiments on wood alchohol and real alcohol, would soon lead you to some easy and distinctive test.' Signed 'Wm Thos Brande'.