Detailed manuscript survey of the defences of Cayenne, French Guiana, with a structured reform proposal (1783).F. d. V: P. Mmoire sur Cayenne. Cayenne, French Guyana, 1783. Manuscript on paper, folio (ca. 31 x 20 cm), [44] pp., written in brown ink, with heavy authorial reworking throughout; several pages with substantial struck passages and rewritten paragraphs; occasional sectional headings (e. g. on front des bastions ), and lists of artillery pices with totals. Sewn. An important detailed military engineering report on the topography, hydrography,