Folio (330 x 210 mm). 37 II. Manuscript in English, in ink, with diagrams, comprising Geometry and Trigonometry (ff.1-6), land surveying (ff.7-19), and plain, traverse, oblique and Mercator sailing (ff.20-37). With an elaborate surveying map, compass, and several diagrams. (Some mostly marginal chipping or tearing occasionally affecting text, small losses to the corners of two leaves.) Original red linen over boards, hand-lettered "C. E." on upper cover. (Upper hinge broken

A portion of the surveying exercise appears to come from William Leybourn's The Compleat Surveyor (see the fourth edition, published 1679, pp. 292-294). Evans personalizes his ciphering book on the first page, including a drawing of his rooster, "Belon is Narr Cock's Father or the Bony Cock a Doodle Doo."  The drawing includes the rooster's spurs, with a note: "Spurr um up my Boy." Evans also includes an aphorism about doing good deeds.