PERU -- JUAN Y SANTACILLA, J. & A. de ULLOA. Observaciones astronomica y phisicas, hechas de orden de S.M. en los Reynos del Peru. Madrid, 1773. (72), xxviii, 396, (12) pp. W. engr. front., engr. ti-vign., engr. headpiece & 9 engr. fold. plates (depicting instruments and a lunar map). 4°. Cont. cf. (Spine rather dam., also affecting front side, weak joints, lower blank margin wormholed at the end, inner margin stained at the beginning, some minor foxing).Second edition, first published in 1748 as a separate volume following Juan's & Ulloa's travel account in 4 vols. The present edition was published alone. Scientific results of the Spanish section of the La Condamine expedition to determine the figure of the earth at the equator. - Sabin 36809.
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