Della Val. II. (Google Books ⧉, Amazon ⧉, Bookshop ⧉)

The Travels of Marco Polo

Very particular accounts of these ventilators will be found in P. della Valle, and in the embassy of Don Garcias de Silva Figueroa. (Della Val. II. 333–335; Figueroa, Fr. Trans. 1667, p. 38; Ramus. I. 293 v.; Macd. Kinneir, p. 69.)