For reasons of convenience, it was ground into a whitish powder and because of its history, this powder had amusing names like "Countess's powder," "Cardinal's powder," and "Jesuits' bark
." The Dauphin of France, the future Louis XIV, caught malaria in 1649 and was treated with the powder that
Thomas Sydenham, practicing medicine in London in the 1660s, accurately described the symptoms of malaria or `intermittent agues' and treated them with a bolus of `the Jesuits' bark
mixed with the conserve of red roses'; presumably the latter was to hide the bitter taste.