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 Prince of Transylvania, but retiring from the Army he went to live at Paris and took these golden drops with him. They were a tincture of perchloride of iron with spirit of ether, but the public believed them to be a solution of gold. They were recommended as a marvellous restorative medicine, and sold (in Paris) at 25 livres (nearly £1) for the half-ounce bottle. So famous were they that Louis XV sent 200 bottles to the Pope as a particularly precious gift. Subsequently Louis gave La Mothe a pension of 4,000 livres a year for the right of making the drops for his Hotel des Invalides, La Mothe and his widow after him retaining the right to sell to the public.

Bestucheff sold his recipe to the Empress Catherine for 3,000 roubles, and by her orders it was passed on to the College of Medicine of St. Petersburg, which published it under the title of the Tinctura Tonica Nervina Bestucheffi. The formula at first published was chemically absurd, but Klaproth corrected it, and the prestige of the quack medicine was destroyed. But an ethereal tincture of perchloride of iron was adopted in most of the Continental pharmacopœias.

It is not clear whether Bestucheff and La Mothe were in association at any time, but their preparations were similar if not identical.

Under the rule of Napoleon I the French Government bought several formulas of secret remedies for about £100 each. None of them either had or has since acquired any popular reputation. The formulas were published in the medical and pharmaceutical journals of the time.