sentences:  Mummia's familiarity as a remedy in Britain is demonstrated by passing references in Shakespeare, Francis Beaumont and John Fletcher, and John Donne, and also by more detailed remarks in the writings of Thomas Browne, Francis Bacon, and Robert Boyle.By the 18th century, skepticism about the pharmaceutical value of mumia was increasing, and medical opinion was turning against its use.The English medical writer John Quincy wrote in 1718 that although mumia was still listed in medicinal catalogues, "it is quite out of use in Prescription".