Huntington Library MS HM 64 is a collection in 197 folios of some seventeen tracts of varying size and content. It was written in England apparently about 1475. This provisional date is based on the relative chronology of a series of related glossaries, several of which will be discussed below. That this date applies to the codex as a whole may be inferred from the fact that it is written throughout in the same hand and that the pagination in a contemporary, if not the same, hand is continuous. What little is known of the later history of the codex will be found in W. J. Wilson's study of alchemical manuscripts.1 It may be, owing to the heterogeneous nature of the material in the codex, that it has not been examined as carefully as other English writings of a similar nature and date. The contents were described by Wilson, though he did not examine it personally. His interest in the alchemical portions precluded a detailed analysis of all of the tracts. Consequently, his descriptions of the nonalchemical portions are brief and, in at least one place, of questionable accuracy. In addition to the usual extracts and anonymous pieces, there is a plague tract, several astronomical and alchemical tracts, and three glossaries. These latter occupy folios 125r135r, 176v-183v, and 184r,-19Ov. It is the last of these three glossaries, described by Wilson as A dictionary of herbs in Latin, which I shall discuss here. These fourteen leaves contain a glossary of plants, minerals, and animal products used as drugs plus a few miscellaneous items denoting pharmaceutical equipment and other matters of interest to the physician and apothe-