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 WORKS IN THE PRESS.

I. Popular treatises on science of the middle-ages : — 1. The Anglo-Saxon manual of astronomy. 2. The Bestiary and Tractatus de Creaturis of Philip de Thaun, in Anglo-Norman verse. 3. The Ymage du Monde, by Gautier de Metz, in French verse. 4. A cosmography in English verse of the 14th century. Edited with translations by Thomas Wright, Esq., M.A., F.S.A.

II. A collection of letters written by Harriot, Brereton, Cavendish, Pell, Morland, and other eminent English mathematicians of the seventeenth century, before the publication of Newton's Principia. Edited by James Orchard Halliwell, Esq., F.R.S., F.S.A., F.R.A.S., &c.

WORKS SUGGESTED FOR PUBLICATION.

III. Treatises on Geometry written in England during the 13th and 14th centuries ; including an hitherto inedited treatise on that subject, by Roger Bacon.

IV. Treatises on the theory and practice of music, of the fifteenth century. From a MS. in the Lansdowne collection in the British Museum.

V. An English treatise on Algorism, or Arithmetic, of the fourteenth century. From a MS. in the Ashmolean Museum at Oxford.

VI. The preface to the Seventh Book of the Mathematical Collections of Pappus Alexandrinus, in the original language; with an English translation, and explanatory notes.

VII. An English tract on the making of oils and medicinal waters,from a MS. of the fourteenth century.

VIII. Proposals for mechanical inventions addressed to Queen Elizabeth by William Bourne, "Master of the Gravesend Barge." From a MS. in the British Museum.

IX. A catalogue of the scientific manuscripts formerly in the library of Dr. John Dee of Mortlake. From Dee's own catalogue in the British Museum.