Skeletons and bones, including the skeleton of a foetus, Line engraving by H. Winkles under the direction of J.G. Heck, 1830, Published in Iconographic Encyclopedia of Science, Litearture and Art , edited by Johann .Georg.Heck 1852 by Garrigue , New York Credit : Skeletons and bones, including the skeleton of a foetus (?). Line engraving by H. Winkles under the direction of J.G. Heck, 1830/1845. Credit: Wellcome Collection. CC BY Wellcome Library.