Description de l'Egypte. Observations météorologiques faites au Kaire en 1799, 1800 et 1801. [Ensemble] Observations sur la vallée d'Egypte et sur l'exhaussement séculaire qui la recouvre

First edition of these two texts, extracted from volume II of the third delivery, Natural History section. Fine printing on strong rag paper.
Modern full cream parchment paper boards. Smooth spine with black sheep title label. Full-margined copy, uncut.
The first memoir consists essentially of monthly tables indicating meteorological readings. The second memoir is a physical description of the valley of Upper Egypt, then a study of the Nile allowing considerations on silting and the continual modifications of the valley, followed by historical considerations...
Some foxing.