Watermarks: Three crescents; initials W+W. For the first see Edward Heawood, Watermarks, Mainly of the 17th and 18th Centuries (Hilversum, 1950), p. 24.Contains star tables and astronomical diagrams.Rubrication on first 5 pp. only; marginal corrections in another hand."A treatise dealing mainly with astrology.... This work merits investigation." David A. King, A Survey of the Scientific Manuscripts in the Egyptian National Library (Winona Lake, 1986), p. 42.