Since the preceding edition was pub-lished, the London college of physicians have given a new edition of their Pharmacopoeia, in several respects materially altered from that of 1746, especially in the chemical preparations and nomenclature. This has made considerable alterations necessary in the present republication of Lewis's Materia Medica, as far as it takes notice of the formulae of the London Dispenfatory. A few additions have likewise been made to the medical history of certain articles; and three new ones have been inserted from the London catalogue, which were not contained in the former editions of this work. These are Helleboraster, Juglans, and Sium.

Great-Yarmouth, Norfolk, J. A.

May 1, 1789.