Butler Burke of Cambridge has also made a series of experiments with radium and barium salts analogous to those of Dubois.
"The Mechanism of Life"
Stéphane Leduc
This is allowed to settle, and the clear liquor being decanted the vessel is filled with water, and when the precipitate settles the liquor is again decanted, and continue to repeat these washings until the sulphate of potash is washed quite out; this is known by adding a little chloride of barium to a small quantity of the washings, and when there is no white precipitate formed by the test, the precipitate is sufficiently washed.
"Young's Demonstrative Translation of Scientific Secrets"
Daniel Young
Thus Davy, starting in 1807, applied the method of electrolysis, using a development of Volta's pile as a source of current; in a short time he discovered aluminum, barium, boron, calcium, magnesium, potassium, sodium, and strontium.
"A Brief History of Element Discovery, Synthesis, and Analysis"
Glen W. Watson