I. Johannis de Sacro Bosco Tractatus de arte numerandi.--II. A method used in England in the fifteenth century for taking the altitude of a steeple or inaccessible object.--III. A treatise on the numeration of algorism.--IV. A treatise on the properties and qualities of glasses for optical purposes, according to the making, polishing, and grinding of them. By William Bourne.--V. Johannis Robyns De cometis commentaria.--VI. Two tables: one shewing the time of high water at London bridge and the other the duration of moon-light.--VII. A treatise on the mensuration of heights and distances.--VIII. An account table for the use of merchants.--IX. Alexandri de Villa Dei Carmen de algorismo.--X. Prefatio Danielis de Merlai ad librum de naturis superiorum et inferiorum.--XI. Proposals for some inventions in the mechanical arts.--XII. Preface to a calendar or almanac for the year 1430.--XIII. Johannis Norfolk In artem progressioni summula.--XIV. Appendix: I. Observations on the numerical contractions found in some manuscripts of the treatise on geometry by Boetius. II. Notes on early almanacs

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