ACQUAPENDENTE, Girolamo Fabrici d' (1533-1619) - De formatione ovi, et pulli tractatus accuratissimus. Padova: ex officina Aloisio Bencio, 1621. [Legato con:] De formato foetu. Padova: ex typographia Lorenzo Pasquat, 1600 (ma 1604 al colophon). [E:] De venarum ostiolis. Padova: ex typographia Lorenzo Pasquat, 1603. [E:] De brutorum. Padova: ex typographia Lorenzo Pasquat, 1603. First editions of the first systematic study of the structure, distribution and position of venous valves, of the first record of the dissection of embryos, of the first printed illustrations of the development of the chick and of the author's earliest surviving treatise on embryology. De venarum ostiolis became Fabrizzi's most influential work, inspiring Harvey to conceptualize the circulation of the blood, and providing a model for the best-known plate in Harvey's De motu cordis (1628). De formatione foetu ""illustrates the way in which nature provides for the necessities of the foetus during its interuterine life"" (DSB). 4 works in one volume, folio (410 x 270mm). Woodcut devices on titles, woodcut initials, De formatione ovi with 3 (of 7) plates, De formato Foetu with 35 (of 33) plates, De venarum ostiolis complete with the 8 plates (title slightly shorter in outer margin), De brutorum with pagination (6), 27, (1) (few tiny marginal wormholes and light waterstaining, few repairs and reinforcements without loss, De formatione ovi: without *3-*4 and final unsigned gathering with 4 plates, lacking errata, title repaired in top corner; De formato foetu without title and blank π2, without D1-D4 with plates IV-VI and O1-O2, P1-P4 with plates XXIII-XXV, lacking errata). Modern half vellum. Provenance: Stanescu family (3 generations: Alessandro, George and Cristian Stanescu; monogram ink stamps). Provenance: "Six luceat lux" (ex libris of the Stanescu family) Bib. Walleriana 136. The lot is accompanied by a export license.